Não informado. (2008). State University of Iowa studies in natural history. State University of Iowa.
Citace podle Chicago (17th ed.)Não informado. State University of Iowa Studies in Natural History. Iowa City, Iowa: State University of Iowa, 2008.
Citace podle MLA (8th ed.)Não informado. State University of Iowa Studies in Natural History. State University of Iowa, 2008.
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