Não informado. (1888). Bulletin from the Laboratories of Natural History of the State University of Iowa. University of Iowa.
Citace podle Chicago (17th ed.)Não informado. Bulletin from the Laboratories of Natural History of the State University of Iowa. Iowa City, Iowa: University of Iowa, 1888.
Citace podle MLA (8th ed.)Não informado. Bulletin from the Laboratories of Natural History of the State University of Iowa. University of Iowa, 1888.
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