Não informado. (2007). Report of the Division of the Agriculture. Iowa State College, Division of the Agriculture.
Citace podle Chicago (17th ed.)Não informado. Report of the Division of the Agriculture. Ames, Iowa: Iowa State College, Division of the Agriculture, 2007.
Citace podle MLA (8th ed.)Não informado. Report of the Division of the Agriculture. Iowa State College, Division of the Agriculture, 2007.
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