1977. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.
1977. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.
1979. United States. Soil Conservation Service. Base compiled in 1976 from USGS 1:24 000-scale topographic maps dated 1960-1972, revised from aerial photographs taken 1975; interpretations derive... Dept. of Agriculture, Soil Conservation Service (Washington.).
1978. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base compiled in 1976; interpretations derived from soil map constructed 1972.; "Projection and 10,000-metre gri... Dept. of Agriculture, Soil Conservation Service (Washington.).
1978. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base map dated 1975; interpretations derived from soil map constructed 1973.; "Projection and 10,000-metre grid ... Dept. of Agriculture, Soil Conservation Service (Washington.).
2001. Jean-Claude M. Thomas and Jerry L. Mullins. Projection: Lambert Conformal Conic Projection - Standard Parallels -76º40' and -79º20'; Series: USGS Satellite Image Maps. United States Geological Survey.
1977. Projection: Lambert Conformal Conic Projection: Standard Parallels -76º40' and -79º20'; Series: USGS 1:50,000 Topographic Series. United States Geological Survey.
1904. Coleman, A. P. (Arthur Philemon), 1852-1939. Parts in New York after H.L. Fairchild.; From the "Thirteenth report of the Bureau of Mines." 45 x 60 centimeters Scale 1 inch = approximately 12 m... U.S. Bureau of Mines? (Washington, D.C.?).