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Spanish Peaks folio, Colorado

Hills, R. C. (Richard Charles), 1848-1923. (Geological Survey (United States), 1901)

Elmoro folio, Colorado

Hills, R. C. (Richard Charles), 1848-1923. (Geological Survey (United States), 1899)

Walsenburg folio, Colorado

Hills, R. C. (Richard Charles), 1848-1923. (Geological Survey (United States), 1900)