1979. 2013-06-13T13:48:52Z. 2013-06-26T19:51:05Z. Marr, John W. (John Winton), 1914-. U.S. Geological Survey. English. Public. Colorado, Douglas County, El Paso County, and Elbert County.
1979. 2013-05-30T20:12:36Z. 2013-06-14T17:58:36Z. Marr, John W. (John Winton), 1914-. U.S. Geological Survey. English. Public. Colorado and Denver Metropolitan Area.
1979. 2014-07-02T20:24:43Z. 2014-07-02T20:24:43Z. Butler, John Robert, 1930-. The Survey. English. Public. Uinta Basin (Utah and Colo.), United States, and Uinta Basin.
1979. 2018-04-10T19:24:01Z. 2018-04-10T19:24:01Z. Morris, Leslie D. Published by World Data Center A for Solid Earth Geophysics for the International Association of Volcanology and Chemistry of the Earth's Interior as a contribution to the International Geodynamics project. English. cartographic image. Public.
1979. 2013-05-28T19:01:54Z. 2013-06-14T17:58:09Z. Hillier, Donald E. U.S. Geological Survey. English. Public. Colorado, Boulder County, Larimer County, and Weld County.