[Washington, D.C.] : U.S. Geological Survey, 1929.
Access:
Public
Description:
United States. Geological Survey. U.S.G.S. Alternate title: Youngsville, PA.N.Y. Polyconic projection. Relief shown by 20 feet contour interval and spot heights. Surveyed in 1926. Verso: The topographic maps of the United States.