Não informado. (1876). Bulletin of the Illinois State Museum of Natural History. Illinois State Museum of Natural History.
Chicago-referens (17:e uppl.)Não informado. Bulletin of the Illinois State Museum of Natural History. Springfield, Ill: Illinois State Museum of Natural History, 1876.
MLA-referens (8:e uppl.)Não informado. Bulletin of the Illinois State Museum of Natural History. Illinois State Museum of Natural History, 1876.
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