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World shipping : an economic geography of ports and seaborne trade
Alexandersson, Gunnar, (1963)
The Port of New York
Griffin, John I., (1959)
The port of Milwaukee. An economic research
Schenker, Eric, (1967)
World Investment Report 2004
(2004)
Discussion papers / United Nations Conference on Trade and Development
Manual on Statistics of International Trade in Services
(2002)