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Twenty-Sixth Annual Report of the Director of the United States Geological Survey, 1904-1905
Charles D. Walcott
1905, Annual Report 26
IntroductionRemarks on the work of the yearBranches of workThe United States Geological Survey was created in 1879 for the purpose—as its name implies—of examining and reporting on the geologic structure and mineral resources and products of the national domain. To the adequate description of geologic formations and structure cartography is...
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...
The lead, zinc, and fluorspar deposits of western Kentucky
E. O. Ulrich, W.S.T. Smith
1905, Professional Paper 36
Geography and distinctive characters. The fluorspar, lead, and zinc deposits that were the subject of the investigations reported in this paper are situated hi Livings ton, Crittenden, and Caldwell, and adjacent portions of Christian, Trigg, and Lyon counties, in western Kentucky, and in the counties immediately across the Ohio River,...