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.
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1972. 2013-04-17T20:17:22Z. 2013-05-02T15:44:47Z. Reed, John Calvin, 1930-. U.S. Geological Survey. English. Public. Colorado and Jefferson 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.
1973. 2013-02-21T20:18:02Z. 2013-03-18T22:37:26Z. Keith, John R. U.S. Geological Survey. English. Public. Colorado, Arapahoe County, and Douglas County.