Não informado. (1977). Geoscience Wisconsin. Wisconsin Geological and Natural History Survey.
Lua i Stíl Chicago (17ú heag.)Não informado. Geoscience Wisconsin. Madison, Wis: Wisconsin Geological and Natural History Survey, 1977.
Lua MLA (8ú heag.)Não informado. Geoscience Wisconsin. Wisconsin Geological and Natural History Survey, 1977.
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