1934. United States. Works Progress Administration of Pennsylvania. Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps shown by contours and spot heights. WPA Project N... Works Progress Administration of Pennsylvania.
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1934. United States. Works Progress Administration of Pennsylvania. Statement of responsibility: [Works Progress Administration of Pennsylvania]. Relief on most maps shown by contours and spot heights. WPA Project N... Works Progress Administration of Pennsylvania.
1980. United States. Soil Conservation Service. Base source: USGS 1:100,000 county base dated 1978; interpretations derived from soil map constructed 1956.; "Projection and 10,000-metre grid tick... Dept. of Agriculture, Soil Conservation Service (Washington.).
1926. United States. Bureau of Public Roads. Shows Federal Aid Highway System, portions of System improved and under construction and national forests.; "Published in accordance with Act of Co... U.S. Geological Survey (Washington, D.C).
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