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"OMB Bulletin No. 10-02"(PDF). Executive Office of Management and Budget. December 1, 2009. p. 74. Archived(PDF) from the original on January 21, 2017. Retrieved September 1, 2013.
"Historic Narratives, Boulder". Montana Government, Department of Environmental Quality. August 2004. Archived from the original on September 17, 2004. Retrieved December 17, 2007.
"Historical Narratives: Basin". Montana Department of Environmental Quality, Montana State Government. Archived from the original on November 2, 2007. Retrieved December 15, 2007.
Salak, Kara; Nordeman, Landon (photographer) (2004). "59631: Mining for Miracles". National Geographic. National Geographic Society. Archived from the original on January 24, 2008. Retrieved December 31, 2007.