1940. United States. Public Roads Administration. Cartographic Details: Scale 1:250,000. approximately 1 in. to 4 miles ; Modified polyconic projection (W 97‚Å∞15 π--W 89‚Å∞30 π/N 49‚Å∞22 π--N 43‚Å... The Survey (Washington D.C.).
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1944. Cartographic Details: Scale 1:250,000. approximately 1 in. to 4 miles ; Modified polyconic projection. Published in accordance with Act of Congress... The Survey (Washington D.C.).