Não informado. (1919). Foreign crops and markets. U.S. Department of Agriculture, Foreign Agricultural Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Foreign Crops and Markets. Washington: U.S. Department of Agriculture, Foreign Agricultural Service, 1919.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Foreign Crops and Markets. U.S. Department of Agriculture, Foreign Agricultural Service, 1919.
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