Não informado. Report of the State Zoologist. Geological and Natural History Survey of Minnesota.
Chicago-referens (17:e uppl.)Não informado. Report of the State Zoologist. Minneapolis, Minn: Geological and Natural History Survey of Minnesota.
MLA-referens (8:e uppl.)Não informado. Report of the State Zoologist. Geological and Natural History Survey of Minnesota.
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