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3. Colorado : Pikes Peak special map

Yale Public content
1909. 2021-07-29T17:08:59Z. 2023-04-25T20:46:41Z. Geological Survey (U.S.). U.S. Geological Survey. English. cartographic image. Public. El Paso County (Colo.), Teller County (Colo.), Colorado, Colorado., El Paso County., and Teller County.

7. Ironton and vicinity, Colorado

Yale Public content
1930. 2018-05-15T19:36:45Z. 2022-12-08T04:43:49Z. Geological Survey (U.S.). U.S. Geological Survey. English. cartographic image. Public. Ouray County (Colo.), San Miguel County (Colo.), Colorado, Ouray County, San Miguel County, Ouray County., and San Miguel County.
1909. 2021-09-17T18:42:40Z. 2021-09-18T03:01:38Z. Geological Survey (U.S.). U.S. Geological Survey. English. cartographic image. Public. Goldfield Region (Nev.), Nye County (Nev.), Esmeralda County (Nev.), Colorado, Goldfield Region, Nevada, Nye County, Esmeralda County, Esmeralda County., and Nye County.
2002. 2002-09-20T18:12:30Z. 2016-07-26T21:19:13Z. Geological Survey (U.S.). U.S. Geological Survey. English. cartographic image. Public. Colorado, Piceance Creek Basin, Uinta Basin (Utah and Colo.), Mancos Shale., Mesaverde Group., Piceance Creek Basin., United States, and Uinta Basin. Cretaceous. and From 65 to 140 million years ago.