Não informado. (1882). Mineral resources of the United States. U.S. Geological Survey.
Lua i Stíl Chicago (17ú heag.)Não informado. Mineral Resources of the United States. Washington: U.S. Geological Survey, 1882.
Lua MLA (8ú heag.)Não informado. Mineral Resources of the United States. U.S. Geological Survey, 1882.
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