Não informado. (1954). Virginia minerals. Department of Conservation and Development, Division of Geology.
Lua i Stíl Chicago (17ú heag.)Não informado. Virginia Minerals. Charlottesville, Va: Department of Conservation and Development, Division of Geology, 1954.
Lua MLA (8ú heag.)Não informado. Virginia Minerals. Department of Conservation and Development, Division of Geology, 1954.
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