Biodiversity Heritage Library
By "Colorado Geological Survey. "
By: Colorado Geological Survey. - Essex Institute.
Publication info: Salem, Mass.
Contributed by: Robarts - University of Toronto (archive.org)
A preliminary report on the geology of the Monarch mining district, Chaffee County, Colorado / by R.D. Crawford.
By: Crawford, R. D. - Colorado Geological Survey.
Publication info: Boulder :Colorado Geological Survey,1910.
Contributed by: University of British Columbia Library (archive.org)