Não informado. (1940). Agricultural Science and Genetics Newsletter. U.S. Department of Agriculture.
Citace podle Chicago (17th ed.)Não informado. Agricultural Science and Genetics Newsletter. Cold Spring Harbor, NY: U.S. Department of Agriculture, 1940.
Citace podle MLA (8th ed.)Não informado. Agricultural Science and Genetics Newsletter. U.S. Department of Agriculture, 1940.
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