Não informado. (1999). Rocky Mountain Geology. University of Wyoming, Department of Geology and Geophysics.
Lua i Stíl Chicago (17ú heag.)Não informado. Rocky Mountain Geology. Laramie, Wyo: University of Wyoming, Department of Geology and Geophysics, 1999.
Lua MLA (8ú heag.)Não informado. Rocky Mountain Geology. University of Wyoming, Department of Geology and Geophysics, 1999.
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