Não informado. (1924). Agricultural situation. U.S. Department of Agriculture, Agricultural Marketing Service.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Agricultural Situation. Washington: U.S. Department of Agriculture, Agricultural Marketing Service, 1924.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Agricultural Situation. U.S. Department of Agriculture, Agricultural Marketing Service, 1924.
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