"April 1983." Pennsylvania coordinate grid. Includes notes, acreage table, and location map. "4R-38,193." 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/87694344/">https://www.loc.gov/item/87694344/</a>