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Silverton folio, Colorado
Whitman Cross, Ernest Howe, F. L. Ransome
1905, Folios of the Geologic Atlas 120
The term San Juan region, or simply "the San Juan," used with variable meaning by early explorers, and naturally with indefinite limitation during the period of settlement, is now quite generally applied to a large tract of mountainous country in southwestern Colorado, together with an undefined zone of lower country...