Não informado. (1945). Agriculture abroad. Department of Agriculture, Economics Division of the Marketing Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Agriculture Abroad. Ottawa: Department of Agriculture, Economics Division of the Marketing Service, 1945.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Agriculture Abroad. Department of Agriculture, Economics Division of the Marketing Service, 1945.
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