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[[Image:Karakorum Highway (KKH) Nanga Parbat.jpg|thumb|right|370px|Pakistani truck on the Karakoram Highwaymarker connecting Pakistan to China. Nanga Parbatmarker is visible in the background. Karakorum Highway follows the Silk Road that Marco Polo used on hisjourney to China.]]

A trade route is a logistical network identified as a series of pathways and stoppages used for the commercial transport of cargo. Allowing good to reach distant markets, a single trade route contains long distance arteries which may further be connected to several smaller networks of commercial and non commercial transportation.

Historically, the period from 1532 BCE–1 CE saw the Western Asian, Mediterraneanmarker, Chinese and Indianmarker societies develop major transportation networks for trade. Europe's early trading routes included the Amber Road, which served as a dependable network for long distance trade. Maritime trade along the Spice route became prominent during the middle ages; nations resorted to military means for control of this influential route. During the Middle Ages organizations such as the Hanseatic League, aimed at protecting interests of the merchants and trade, also became increasingly prominent.

With the advent of modern times, commercial activity shifted from the major trade routes of the Old World to newer routes between modern nation states. This activity was sometimes carried out without traditional protection of trade and under international free trade agreements, which allowed commercial goods to cross borders with relaxed restrictions. Innovative transportation of the modern times includes pipeline transport, and the relatively well known trade using rail routes, automobiles and cargo airlines.

Development of early routes

Early development

The period extending from the middle of the 2nd millennium BCE to the beginning of the Common Era saw the Western Asian, Mediterranean, Chinese and Indian societies develop major transportation networks for trade.

One of the vital instruments which facilitated long distance trade was portage and the domestication of beasts of burden. Organized caravans, visible by the 2nd millennium BCE, could carry goods across a large distance as fodder was mostly available along the way. The domestication of camels allowed Arabian nomads to control the long distance trade in spices and silk from the Far East to the Arabian Peninsula. However, caravans were useful in long-distance trade largely for carrying luxury goods, the transportation of cheaper goods across large distances was not profitable for caravan operators. With productive developments in iron and bronze technologies, newer trade routes - dispensing innovations of civilizations - began to rise slowly.

Maritime trade

Visible maritime trade between civilizations can be traced back to at least two millennia. Navigation was known in Sumer between the 4th and the 3rd millennium BCE, and was probably known by the Indians and the Chinese people before the Sumerians. The Egyptians had trade routes through the Red seamarker, importing spices from the "Land of Punt" (East Africa) and from Arabia.

Maritime trade began with safer coastal trade and evolved with the manipulation of the monsoon winds, soon resulting in trade crossing boundaries such as the Arabian Seamarker and the Bay of Bengalmarker. South Asia had multiple maritime trade routes which connected it to Southeast Asia, thereby making the control of one route resulting in maritime monopoly difficult. Indian connections to various Southeast Asian states buffered it from blockages on other routes. By making use of the maritime trade routes, bulk commodity trade became possible for the Romans in the 2nd century BCE. A Roman trading vessel could span the Mediterranean Seamarker in a month at one-sixtieth the cost of over-land routes.

Visible trade routes

The peninsula of Anatoliamarker lay on the commercial land routes to Europe from Asia as well as the sea route from the Mediterranean to the Black Seamarker. Records from the 19th century BCE attest to the existence of an Assyrian merchant colony at Kanesh in Cappadociamarker (now in modern Turkeymarker). Trading networks of the Old World included the Grand Trunk Road of Indiamarker and the Incense Road of Arabia. A transportation network consisting of hard-surfaced highways, using concrete made from volcanic ash and lime, was built by the Romans as early as 312 BCE, during the times of the Censor Appius Claudius Caecus. Parts of the Mediterranean world, Roman Britain, Tigris-Euphrates river system and North Africa fell under the reach of this network at some point of their history.

According to Robert Allen Denemark (2000):

"The spread of urban trading networks, and their extension along the Persian Gulfmarker and eastern Mediterranean, created a complex molecular structure of regional foci so that as well as the zonation of core and periphery (originally created around Mesopotamia) there was a series of interacting civilizations: Mesopotamia, Egypt, the Indus Valley; then also Syriamarker, central Anatolia (Hittites) and the Aegean (Minoans and Mycenaeans). Beyond this was a margin which included not only temperate areas such as Europe, but the dry steppe corridor of central Asia. This was truly a world system, even though it occupied only a restricted portion of the western Old World. Whilst each civilization emphasized its ideological autonomy, all were identifiably part of a common world of interacting components."

These routes - spreading religion, trade and technology - have historically been vital to the growth of urban civilization. The extent of development of cities, and the level of their integration into a larger world system, has often been attributed to their position in various active transport networks.

Historic trade routes

Combined land and waterway routes

Incense Route

The Incense Route served as a channel for trading of Indian, Arabian and East Asian goods. The incense trade flourished from South Arabia to the Mediterranean between roughly the 3rd century BCE to the 2nd century CE. This trade was crucial to the economy of Yemenmarker and the frankincense and myrrh trees were seen as a source of wealth by the its rulers.

Ptolemy II Philadelphus, emperor of Ptolemaic Egypt, may have forged an alliance with the Lihyanites in order to secure the incense route at Dedanmarker, thereby rerouting the incense trade from Dedan to the coast along the Red Sea to Egypt. I. E. S. Edwards connects the Syro-Ephraimite War to the desire of the Israelites and the Aramaeans to control the northern end of the Incense route, which ran up from Southern Arabia and could be tapped by commanding Transjordanmarker.

Gerrha - inhabited by Chaldean exiles from Babylonmarker - controlled the Incense trade routes across Arabia to the Mediterranean and exercised control over the trading of aromatics to Babylon in the 1st century BC. The Nabateans exercised control over the routes along the Incense Route, and their hold was challenged - without success - by Antigonus Cyclops, emperor of Syria and Palestine. The Nabatean control over trade further increased and spread in many directions.

The replacement of Greecemarker by the Roman empire as the administrator of the Mediterranean basin led to the resumption of direct trade with the East and the elimination of the taxes extracted previously by the middlemen of the south. According to Milo Kearney (2003) "The South Arabs in protest took to pirate attacks over the Roman ships in the Gulf of Adenmarker. In response, the Romans destroyed Aden and favored the Western Abyssinian coast of the Red Sea." Indian ships sailed to Egypt as the maritime routes of Southern Asia were not under the control of a single power.

Pre-Columbian trade

Some similarities between the Mesoamerican and the Andean cultures suggest that the two regions became a part of a wider world system, as a result of trade, by the 1st millennium BCE. The current academic view is that the flow of goods across the Andean slopes was controlled by institutions distributing locations to local groups, who were then free to access them for trading. This trade across the Andean slopes - described sometimes as "vertical trade" - may have overshadowed the long distance trade between the people of the Andes and the neighboring forests. The Callawaya herbalists traded in tropical plants between 6th and the 10th centuries, while copper was dealt by specialized merchants in the Peruvianmarker valley of Chincha. Long distance trade may have seen local elites resorting to struggle in order for manipulation and control.

Prior to the Inca dominance, specialized long distance merchants provided the highlanders with goods such as gold nuggets, copper hatches, cocoa, salt etc. for redistribution among the locals, and were key players in the politics of the region. Hatchet shaped copper currency was produced by the Peruvian people, in order to obtain valuables from pre Columbian Ecuadormarker. A maritime exchange system stretched from the west coast of Mexicomarker to southernmost Peru, trading mostly in Spondylus, which represented rain, fertility and was considered the principal food of the gods by the people of the Inca empire. Spondylus was used in elite rituals and the effective redistribution of it had political effect in the Andes during the pre-Hispanic times.

Predominantly overland routes

Silk Route

Trading routes used around the 1st century CE centred on the Silk Road.
The Silk road was one of the first trade routes to join the Eastern and the Western worlds. According to Vadime Elisseeff (2000):

"Along the Silk Roads, technology traveled, ideas were exchanged, and friendship and understanding between East and West were experienced for the first time on a large scale. Easterners were exposed to Western ideas and life-styles, and Westerners too, learned about Eastern culture and its spirituality-oriented cosmology. Buddhism as an Eastern religion received international attention through the Silk Roads."

Cultural interactions patronized often by powerful emperors, such as Kanishka, led to development of art due to introduction of a rich variety of influences. Buddhist missions thrived along the Silk Roads, partly due to the conducive intermixing of trade and cultural values, which created a series of safe stoppages for both the pilgrims and the traders. Among the frequented routes of the Silk Route was the Burmesemarker route extending from Bhamomarker, which served as a path for Marco Polo's visit to Yunnanmarker and Indian Buddhist missions to Cantonmarker in order to establish Buddhist monasteries. This route - often under the presence of hostile tribes - also finds mention in the works of Rashid al-Din.

Grand Funk Railroad

The Grand Trunk Road - connecting Calcuttamarker in India to Peshawarmarker in Pakistanmarker - has existed for over two and a half millennia. One of the important trade routes of the world, this road has been a strategic artery with fortresses, halting posts, well, post offices, milestones and other facilities. Part of this road through Pakistan also coincided with the Silk Road.

This highway has been associated with emperors Chandragupta Maurya and Sher Shah Suri, the latter became synonymous with this route due to his role in ensuring the safety of the travelers and the upkeep of the road. Emperor Sher Shah widened and realigned the road to other routes, and provided approximately 1700 roadside inns through his empire. These inns provided free food and lodgings to the travelers regardless of their status.

The British occupation of this road was of special significance for the British Raj in India. Bridges, pathways and newer inns were constructed by the British for the first thirty seven years of their reign since the occupation of Punjab in 1849. The British followed roughly the same alignment as the old routes, and at some places the newer routes ran parallel to the older routes.

Vadime Elisseeff (2000) comments on the Grand Trunk Road:
"Along this road marched not only the mighty armies of conquerors, but also the caravans of traders, scholars, artists, and common folk. Together with people, moved ideas, languages, customs, and cultures, not just in one, but in both directions. At different meeting places - permanent as well as temporary - people of different origins and from different cultural backgrounds, professing different faiths and creeds, eating different foods, wearing different clothes, and speaking different languages and dialects would meet one another peacefully. They would understand one another's food, dress, manner, and etiquette, and even borrow words, phrases, idioms and, at times, whole languages from others."

Abby Road

The Amber Route.

The Amber Road was a European trade route associated with the trade and transport of amber. Amber satisfied the criteria for long distance trade as it was light in weight and was in high demand for ornamental purposes around the Mediterranean. Before the establishment of Roman control over areas such as Pannonia, the Amber Road was virtually the only route available for long distance trade.

Towns along the Amber Road began to rise steadily during the 1st century CE, despite the troop movements under Titus Flavius Vespasianus and his son Titus Flavius Domitianus.Under the reign of Tiberius Caesar Augustus, the Amber Road was straightened and paved according to the prevailing urban standards. Roman towns began to appear along the road, initially founded near the site of Celtic oppida.

The 3rd century saw the Danube river become the principal artery of trade, eclipsing the Amber Road and other commercial routes. The redirection of investment to the Danubian forts saw the towns along the Amber Road growing slowly, though yet retaining their prosperity. The prolonged struggle between the Romans and the barbarians further left its mark on the towns along the Amber Road.

Via Maris

Via Maris, literally Latin for "the way of the sea," was an ancient highway used by the Romans and the Crusaders. The states controlling the Via Maris were in a position to grant access for trade to their own citizens and collect tolls from the outsiders to maintain the trade route. The name Via Maris is a Latin translation of a Hebrew phrase related to Isaiah. Due to the Biblical significance of this ancient route, many attempts to find its present day location have been made by Christian pilgrims. 13th century traveler and pilgrim Burchard of Mount Zionmarker refers to the Via Maris route as a way leading along the shore of the Sea of Galileemarker.

Trans Saharan trade

Early Muslim writings confirm that the people of West Africa operated a sophisticated network of trade, usually under the authority of a monarch who levied taxes and provided bureaucratic and military support to his kingdom. Sophisticated mechanisms for the economic and political development of the involved African areas were in place before Islam further strengthened trade, towns and government in western Africa. The capital, court and trade of the region find mention in the works of scholar Abū 'Ubayd 'Abd Allāh al-Bakrī; the mainstay of the trans Saharan trade was gold and salt.

The powerful Saharan tribes, Berber in origin and later adapting to Muslim and Arab cultures, controlled the channels to western Africa by making efficient use of horse-drawn vehicles and pack animals. The Songhai engaged in a struggle against the Sa'di dynasty of Moroccomarker over the control of the trans Saharan trade, resulting in damage on both sides and a weak Moroccan victory, further strengthening the uninvolved Saharan tribes. Struggles and disturbances continued till the 14th century, by which the Mandé merchants were trading with the Hausa, between Lake Chadmarker and the Nigermarker. Newer trade routes developed following extension of trade.

Hanseatic trade

Main trading routes of the Hanseatic League.
Shortly before the 12th century the Germans played a relatively modest role in the north European trade. However, this was to change with the development of Hanseatic trade, as a result of which German traders became prominent in the Balticmarker and the North Seamarker regions. Following the death of Eric VI of Denmark, German forces attacked and sacked Denmarkmarker, bringing with them artisans and merchants under the new administration which controlled the Hansa regions. During the third quarter of the 14th century the Hanseatic trade faced two major difficulties: economic conflict with the Flanders and hostilities with Denmark. These events led to the formation of an organized association of Hanseatic towns, which replaced the earlier union of German merchants. This new Hansa of the towns - aimed at protecting interests of the merchants and trade - became prominent for the next hundred and fifty years.

Philippe Dollinger associates the downfall of the Hansa to a new alliance between Lubeckmarker, Hamburgmarker and Bremenmarker, which outshadowed the older institution. He further sets the date of dissolution of the Hansa at 1630 and concludes that the Hansa was almost entirely forgotten by the end of the 18th century. Scholar Georg Friedrich Sartorius published the first monograph regarding the community in the early years of the 19th century.

Predominantly maritime routes

Roman-India routes

The Ptolemaic dynasty had initiated Greco-Roman maritime trade contact with India using the Red Sea ports. The Roman historian Strabo mentions a vast increase in trade following the Roman annexation of Egypt, indicating that monsoon was known and manipulated for trade in his time. By the time of Augustus up to 120 ships were setting sail every year from Myos Hormos to India, trading in a diverse variety of goods. Arsinoe, Berenice Troglodyticamarker and Myos Hormos were the principal Roman ports involved in this maritime trading network, while the Indian ports included Barbaricum, Barygaza, Muziris and Arikamedu.

The Indians were present in Alexandriamarker and the Christian and Jew settlers from Rome continued to live in India long after the fall of the Roman empire, which resulted in Rome's loss of the Red Seamarker ports, previously used to secure trade with India by the Greco-Roman world since the time of the Ptolemaic dynasty.

Spice Route

As trade between India and the Greco-Roman world increasedAt any rate, when Gallus was prefect of Egypt, I accompanied him and ascended the Nile as far as Syenemarker and the frontiers of Ethiopia, and I learned that as many as one hundred and twenty vessels were sailing from Myos Hormos to India, whereas formerly, under the Ptolemies, only a very few ventured to undertake the voyage and to carry on traffic in Indian merchandise. - Strabo (II.5.12.); Source. spices became the main import from India to the Western world, bypassing silk and other commodities. The Indian commercial connection with South East Asia proved vital to the merchants of Arabia and Persia during the 7th century and the 8th century.

The Abbasids used Alexandria, Damiettamarker, Adenmarker and Sirafmarker as entry ports to India and Chinamarker. Merchants arriving from India in the port city of Aden paid tribute in form of musk, camphor, ambergris and sandalwood to Ibn Ziyad, the sultan of Yemen. Moluccanmarker products shipped across the ports of Arabia to the Near East passed through the ports of India and Sri Lankamarker. Indian exports of spices find mention in the works of Ibn Khurdadhbeh (850), al-Ghafiqi (1150 AD), Ishak bin Imaran (907) and Al Kalkashandi (14th century). After reaching either the Indian or the Sri Lankan ports, spices were sometimes shipped to East Africa, where they were used for many purposes, including burial rites.

On the orders of Manuel I of Portugal, four vessels under the command of navigator Vasco da Gama rounded the Cape of Good Hopemarker, continuing to the eastern coast of Africa to Malindimarker to sail across the Indian Ocean to Calicutmarker. The wealth of the Indies was now open for the Europeans to explore; the Portuguese Empire was one of the early European empires to grow from spice trade.

Modern routes

The modern times saw development of newer means of transport and often controversial free trade agreements, which altered the political and logistical approach prevalent during the Middle Ages. Newer means of transport led to the establishment of new routes, and countries opened up borders to allow trade in mutually agreed goods as per the prevailing free trade agreement. Some old trading route were reopened during the modern times, although in different political and logistical scenarios. The entry of harmful foreign pollutants by the way of trade routes has been a cause of alarm during the modern times. A conservative estimate stresses that future damages from harmful animal and plant diseases may be as high as 134 billion US dollars in the absence of effective measures to prevent the introduction of unwanted pests through various trade routes.

Wagonway routes

Networks, like the Santa Fe Trail and the Oregon Trail, became prominent in the United States with wagon trains gaining popularity as a mode of long distance overland transportation for both people and goods. The Oregonmarker-Californiamarker routes were highly organized with planned rendezvous locations and essential supplies. The settlers in the United States used these wagon trains - sometimes made up of 100 of more Conestoga wagons - for westward emigration during the 18th and the 19th centuries. Among the challenges faced by the wagon route operators were crossing rivers, mountains and hostile Native American. Preparations were also made according to the weather and protection of trade and travelers was ensured by a few guards on horseback.

Wagon freighting was also essential to American growth until it was replaced by the railroad and the truck.

Railway routes

Route of the first American transcontinental railroad from Sacramento, California, to Council Bluffs, Iowa.
The 1844 Railway act of Englandmarker compelled at least one train to a station every day with the third class fares priced at a penny a mile. Trade benefited as the workers and the lower classes had the ability to travel to other towns frequently. Suburban communities began to develop and towns began to spread outwards. The British constructed a vast railway network in India, but it was considered to serve a strategic purpose in addition to the commercial purpose. The efficient use of rail routes helped in the unification of the United States of Americamarker.

The modern times saw nations struggle for the control of rail routes: The Trans-Siberian Railway was intended to be used by the Russianmarker government for control of Manchuria and later China; the Germanmarker forces wanted to establish Berlin-Baghdad Railway in order to influence the Near East; and the Austrianmarker government planned a route from Viennamarker to Salonikamarker for control of the Balkans.

According to the Encyclopedia Britannica (2002):

Railroads reached their maturity in the early 20th century, as trains carried the bulk of land freight and passenger traffic in the industrialized countries of the world. By the mid-20th century, however, they had lost their preeminent position. The private automobile had replaced the railroad for short passenger trips, while the airplane had usurped it for long-distance travel, especially in the United States. Railroads remained effective, however, for transporting people in high-volume situations, such as commuting between the centres of large cities and their suburbs, and medium-distance travel of less than about 300 miles between urban centres.

Although railroads have lost much of the general-freight-carrying business to semi-trailer trucks, they remain the best means of transporting large volumes of such bulk commodities as coal, grain, chemicals, and ore over long distances. The development of containerization has made the railroads more effective in handling finished merchandise at relatively high speeds. In addition, the introduction of piggyback flatcars, in which truck trailers are transported long distances on specially-designed cars, has allowed railroads to regain some of the business lost to trucking.

Modern road networks

The advent motor vehicles created a demand for better use of highways. Roads evolved into two way roads, expressways, freeways and tollways during the modern times. Existing roads were developed and highways were designed according to intended use.

Trucks came into widespread use in the Western World during World War I, and quickly gained reputation as a means of long distance transportation of goods. Modern highways, such as the Trans-Canada Highway, Highway 1 and Pan-American Highway allowed transport of goods and services across great distances. Automobiles continue to play a crucial role in the economies of the Industrialized countries, resulting in rise of businesses such as motor freight operation and truck transportation.

The emission rate for cars using highways has been on a decline between 1975 and 1995 due to regulations and the introduction of unleaded petrol. This trend is especially notable since there has been a growth in vehicles and vehicle miles traveled by automobiles using these highways.

Modern maritime routes

Modern shipping lanes
Canals in the US circa 1825.

A consistent shift from land based trade to sea based trade has been recorded since the last three millennia. The strategic advantages of port cities as trading centers are many: they are both less dependent on vital connections and less vulnerable to blockages. Oceanic ports can help forge trading relationships with other parts of the world easily.

Modern maritime trade routes - sometimes in the form of artificial canals like the Suez Canalmarker - had visible impact on the economic and political standing of nations. The opening of the Suez Canal altered British interactions with the colonies of the British Empire as the dynamics of transportation, trade and communication had now changed drastically. Other waterways, like the Panama Canalmarker played an important role in the histories of many nations. Inland water transportation remained significantly important even as the advent of railroads and automobiles resulted in a steady decline of canals. Inland water transport is still used for the transportation of bulk commodities eg. grains, coal, and ore.

Waterway commerce was historically important to Europe, particularly to Russia. According to the Encyclopedia Brittanica (2002): "Russia has been a significant beneficiary. Not only have inland waterways opened vast areas of its interior to development, but Moscow-linked to the Whitemarker, Balticmarker, Blackmarker, Caspianmarker, and Azovmarker seas by canals and rivers-has become a major inland port."

Oil spills are recorded both in case of maritime routes and pipeline routes to the main refineries. Oil spills, amounting to as much as 7.56 billion liters of oil entering the oceans every year, occur due to damaged equipment or human error.

Free Trade Areas



Historically, governments followed a policy of protection of trade. International Free Trade became visible in 1860 with the Anglo-French commercial treaty and the sentiment further gained momentum during the post World War II era.

According to The Columbia Encyclopedia, Sixth Edition:

"After World War II, strong sentiment developed throughout the world against protection and high tariffs and in favor of freer trade. The results were new organizations and agreements on international trade such as the General Agreement on Tariffs and Trade (1948), the Benelux Economic Union (1948), the European Economic Community (Common Market, 1957), the European Free Trade Association (1959), Mercosur (the Southern Cone Common Market, 1991), and the World Trade Organization (1995). In 1993, the North American Free Trade Agreement (NAFTA) was approved by the governments of Canada, Mexico, and the United States. In the early 1990s, the nations of the European Union (the successor organization to the Common Market) undertook to remove all barriers to the free movement of trade and employment across their mutual borders."

On May 2004, the United States of America signed the American Free trade Agreement with five Central American nations.

Air routes

Air transport has become an indispensable part of the modern society. People having been using air transport both for long and middle distances, with the average route length of long distances being 720 kilometers in Europe and 1220 kilometers in the US. This enormous industry annually carries 1600 million passengers worldwide, and covers a 15 million kilometer network with an annual turnover of 260 billion dollars.

The national, international and global economies are linked to this mode of transportation, making it vital to many other industries. Newer trends of liberalization of trade have further led to establishment of routes among nations bound by agreements. One such example is the American Open Skies policy, which led to greater openness in many international markets, but some international restrictions have survived even during the present times.

Express delivery through international cargo airlines touched US $ 20 billion in 1998 and, according to the World Trade Organization, is expected to triple in 2015. In 1998, 50 pure cargo service companies operated internationally.

Pipeline networks

Route of the Baku-Tbilisi-Ceyhan pipeline.
The economic importance of pipeline transport - responsible for a high percentage of oil and natural gas transportation - is often undermined by the general public due to the lack of visibility of this mode. Generally held to be safer and more economical and reliable than the other modes of transport, this mode has many advantages over rival modes, such as trucks and railways. Examples of modern pipeline transport include Alashankou-Dushanzi Crude Oil Pipeline and Iran-Armenia Natural Gas Pipeline. International pipeline transport projects, like the Baku-Tbilisi-Ceyhan pipeline, presently connect modern nation states - in this case Azerbaijanmarker, Georgiamarker and Turkey - through pipeline networks.

In some select cases, pipelines can even transport solids, such as coal and other minerals, over long distances; short distance transportation of goods such as grain, cement, concrete, solid wastes, pulp etc. is also feasible.

See also


  1. Denemark 2000: 274
  2. Donkin 2003: 169
  3. Denemark 2000: 207
  4. Denemark 2000: 208
  5. Stearns 2001: 41
  6. Denemark 2000: 213
  7. Denemark 2000: 39
  8. Rawlinson 2001: 11-12
  9. Denemark 2000: 107
  10. Toutain 1979: 243
  11. Scarre 1995
  12. Stearns 2001: 37
  13. Roman road system (Encyclopedia Britannica 2002)
  14. Denemark 2000: 124
  15. Denemark 2000: 126
  16. Denemark 2000: 273
  17. Glasse 2001: 59
  18. Kitchen 1994: 46
  19. Edwards 1969: 329
  20. Larsen 1983: 56
  21. Eckenstein 2005: 86
  22. Lach 1994: 13
  23. Kearney 2003: 42
  24. Denemark 2000: 252
  25. Denemark 2000: 239
  26. Denemark 2000: 241
  27. Elisseeff 2000: 326
  28. Elisseeff 2000: 5
  29. Elisseeff 2000: 14
  30. Elisseeff 2000: 158
  31. Elisseeff 2000: 161
  32. Elisseeff 2000: 163
  33. Elisseeff 2000: 178
  34. Burns 2003: 213
  35. Burns 2003: 216
  36. Burns 2003: 211
  37. Burns 2003: 229
  38. Burns 2003: 231
  39. Orlinsky 1981: 1064
  40. Orlinsky 1981: 1065
  41. Silver 1983: 49
  42. western Africa, history of (Encyclopedia Britannica 2002)
  43. Dollinger 1999: page 9
  44. Dollinger 1999: page 42
  45. Dollinger 1999: page 54
  46. Dollinger 1999: 62
  47. Dollinger 1999: page xix
  48. Dollinger 1999: page xx
  49. Shaw 2003: 426
  50. Young 2001: 20
  51. Lindsay 2006: 101
  52. Freeman 2003: 72
  53. Lach 1994: 18
  54. Curtin 1984: 100
  55. Holl 2003: 9
  56. Ball 2000: 131
  57. Ball 2000: 137
  58. Donkin 2003: 59
  59. Donkin 2003: 91-92
  60. Donkin 2003: 92
  61. Gama, Vasco da. The Columbia Encyclopedia, Sixth Edition. Columbia University Press.
  62. Historic India-China link opens (BBC)
  63. Schulze & Ursprung 2003: 104
  64. wagon train (Encyclopedia Britannica 2002)
  65. Seaman 1973: 29-30
  66. Seaman 1973: 30
  67. Seaman 1973: 348
  68. Seaman 1973: 379
  69. automotive industry (Encyclopedia Britannica 2002)
  70. roads and highways (Encyclopedia Britannica 2002)
  71. truck (Encyclopedia Britannica 2002)
  72. Schwela & Zali 2003: 156
  73. Denemark 2000: 282
  74. Denemark 2000: 283
  75. Carter 2004
  76. Major 1993
  77. canals and inland waterways (Encyclopedia Britannica 2002)
  78. canal (Encyclopedia Britannica 2002)
  79. Krech et al. 2003: 966
  80. free trade. The Columbia Encyclopedia, Sixth Edition. 2001-05.
  81. Button 2004
  82. Button 2004: 9
  83. Hindley 2004: 41
  84. pipeline (Encyclopedia Britannica 2002)
  85. BP Caspian: Baku-Tbilisi-Ceyhan Pipeline (Overview)


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