"Map edited 1979." Title in lower margin: Hampshire Co., Mass. : N4210.5-W7211.5/23.5x53, 1979. "Compiled from USGS 1:24,000-scale topographic maps dated 1964-1973. Planimetry revised from aerial photographs taken 1975 and other source data." Available also through the Library of Congress Web site as a raster image.
United States. Soil Conservation Service
1979
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/81690019/">https://www.loc.gov/item/81690019/</a>