Não informado. (1931). Geological Bulletin. Department of Conservation, Geological Survey.
Lua i Stíl Chicago (17ú heag.)Não informado. Geological Bulletin. New Orleans, La: Department of Conservation, Geological Survey, 1931.
Lua MLA (8ú heag.)Não informado. Geological Bulletin. Department of Conservation, Geological Survey, 1931.
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