Não informado. (1937). Foreign agriculture. U.S. Department of Agriculture, Foreign Agricultural Service.
Citace podle Chicago (17th ed.)Não informado. Foreign Agriculture. Washington: U.S. Department of Agriculture, Foreign Agricultural Service, 1937.
Citace podle MLA (8th ed.)Não informado. Foreign Agriculture. U.S. Department of Agriculture, Foreign Agricultural Service, 1937.
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