Não informado. (1907). Proceedings of the American Society of Agronomy. American Society of Agronomy.
Citace podle Chicago (17th ed.)Não informado. Proceedings of the American Society of Agronomy. Washington: American Society of Agronomy, 1907.
Citace podle MLA (8th ed.)Não informado. Proceedings of the American Society of Agronomy. American Society of Agronomy, 1907.
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