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:
- Trace Elements Memorandum Report 399 (Verdure 1)
- Trace Elements Memorandum Report 406 (Verdure 2)
- Trace Elements Memorandum Report 438 (Verdure 4)
- Trace Elements Memorandum Report 405 (Verdure 6)
- Trace Elements Memorandum Report 395 (Verdure 7)
- Trace Elements Memorandum Report 403 (Verdure 8)