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Dyfyniad Arddull ChicagoUnited States. Dept. of Agriculture. Economic Research Service, United States. World Agricultural Outlook Board, United States. Foreign Agricultural Service, Statistics United States. Dept. of Agriculture. Economics, and United States. World Food and Agricultural Outlook and Situation Board. Foreign Agriculture Circular. Washington, D.C.: Foreign Agricultural Service, 1979.
Dyfyniad MLAUnited States. Dept. of Agriculture. Economic Research Service, et al. Foreign Agriculture Circular. Foreign Agricultural Service, 1979.