"July 1978." "Base map prepared by SCS, Portland Carto Unit from USGS 1:1,000,000 national atlas. Thematic detail prepared by state staff from Geologic Map of New Mexico by Carle H. Dane and George O. Bachman, 1965 U.S. Dept. of Interior Geological Survey." Includes location map. "M7-EN-22828-12." Available also through the Library of Congress Web site as a raster image.
United States. Soil Conservation Service
1978
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/2003621375/">https://www.loc.gov/item/2003621375/</a>