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  1. Bulletin.
    By: Colorado Geological Survey. - Essex Institute.
    Publication info: Salem, Mass.
    Holding Institution: Multiple institutions
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  2. A preliminary report on the geology of the Monarch mining district, Chaffee County, Colorado / by R.D. Crawford.
    By: Crawford, R. D. (Ralph Dixon), - Colorado Geological Survey.
    Publication info: Boulder :Colorado Geological Survey,1910.
    Holding Institution: University of British Columbia Library (archive.org)
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