1980. 2013-06-13T13:55:36Z. 2013-06-26T19:51:05Z. Hillier, Donald E. The Survey : For sale by Branch of Distribution, U.S. Geological Survey, Denver, Colo. English. Public. Front Range (Colo. and Wyo.), Colorado, Douglas County, El Paso County, Elbert County, Fremont County, and Teller County.
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1980. 2013-06-13T13:57:34Z. 2013-06-26T19:51:05Z. Hillier, Donald E. The Survey : For sale by Branch of Distribution, U.S. Geological Survey, Denver, Colo. English. Public. Front Range (Colo. and Wyo.), Colorado, Douglas County, El Paso County, Elbert County, Fremont County, and Teller County.