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The United States in the changing world economy
(1972)
U. S. foreign trade in the seventies
Hazen, N. William, (1971)
A survey of waterborne foreign trade trends of San Francisco Bay
Keller, Samuel A., (1963)
Forecasting regional exports : new tests of shift-share techniques
Williamson, Robert B., (1980)
The importance of "export" trade to community economic development
Williamson, Robert B., (1965)
The Lower Rio Grande Valley: an economic profile
Williamson, Robert B., (1966)