Trade routes in the Indian Ocean, c. 500-1000 CE [electronic resource].

Organization of Petroleum Exporting Countries (OPEC), 1973 [electronic resource].

Great Depression, 1929-1939 [electronic resource].

U.S. population change, 1980-1994 [electronic resource].

Eurasia and the Silk Roads, 100BCE [electronic resource].

U.S. population change, 1950-1970 [electronic resource].

Industrialization and urbanization in Europe, c. 1850 [electronic resource].

Copenhagen [electronic resource].

Oslo [electronic resource].

Naples [electronic resource].

Calais [electronic resource].

Haines [electronic resource].

Rostock [electronic resource].

Fort-de-France [electronic resource].

Hong Kong [electronic resource].

Venice [electronic resource].

Arica [electronic resource].

Nome [electronic resource].

Akureyri [electronic resource].

Durban [electronic resource].