"February 1983." Includes location map and acreage table. "4-R-38139." Available also through the Library of Congress Web site as a raster image.
United States. Soil Conservation Service; National Cartographic Center (U.S.)
1983
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/87694308/">https://www.loc.gov/item/87694308/</a>