Robert J. Hackman 1952 <p>Base maps compiled by Soil Conservation Service, U.S. Department of Agriculture. These maps are compilations of photogeology and surface geology, Colorado Plateau area, United States. They are also known as:</p> <ul> <li>Trace Elements Memorandum Report 399 (Verdure 1)</li> <li>Trace Elements Memorandum Report 406 (Verdure 2)</li> <li>Trace Elements Memorandum Report 438 (Verdure 4)</li> <li>Trace Elements Memorandum Report 405 (Verdure 6)</li> <li>Trace Elements Memorandum Report 395 (Verdure 7)</li> <li>Trace Elements Memorandum Report 403 (Verdure 8)</li> </ul> application/pdf 10.3133/ofr5263 en U.S. Geological Survey Photogeologic maps of the Verdure 1, 2, 4, 6, 7, and 8 quadrangles, Utah and Colorado reports