Não informado. (1946). Information Circular. Missouri Geological Survey and Water Resources.
Lua i Stíl Chicago (17ú heag.)Não informado. Information Circular. Rolla, Mo: Missouri Geological Survey and Water Resources, 1946.
Lua MLA (8ú heag.)Não informado. Information Circular. Missouri Geological Survey and Water Resources, 1946.
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