Não informado. (2009). Mines and Mineral Statistics. Commissioner of Mineral Statistics of the State of Michigan.
Lua i Stíl Chicago (17ú heag.)Não informado. Mines and Mineral Statistics. Lansing, Mich: Commissioner of Mineral Statistics of the State of Michigan, 2009.
Lua MLA (8ú heag.)Não informado. Mines and Mineral Statistics. Commissioner of Mineral Statistics of the State of Michigan, 2009.
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