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By "Colorado Geological Survey. "
By: Colorado Geological Survey. - Essex Institute.
Publication info: Salem, Mass.
Holding Institution: Multiple institutions
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)