Não informado. (2000). Technical papers. U.S. Department of the Interior, Bureau of Mines.
Lua i Stíl Chicago (17ú heag.)Não informado. Technical Papers. Washington: U.S. Department of the Interior, Bureau of Mines, 2000.
Lua MLA (8ú heag.)Não informado. Technical Papers. U.S. Department of the Interior, Bureau of Mines, 2000.
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