1. Engineer Mountain folio, Colorado / by Whitman Cross and Allen D. Hole ; Department of the Interior, United States Geological Survey Yale Public content 1910. 2013-03-14T16:30:23Z. 2013-03-14T16:30:23Z. Cross, Whitman, 1854-1949. The Survey. English. Public. Colorado, La Plata County, San Juan County, Dolores County, Montezuma County, and États-Unis.