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Lehman, Ambrose E. (Ambrose Edwin), 1851-1917. (1875 - 1885). Topographical map (in 10 foot contour lines) of the South Mountains in Adams, Franklin, Cumberland and York Counties. [JPEG]. Geological Survey of Pennsylvania (Harrisburg, Pa). Retrieved from https://geodata.lib.berkeley.edu/catalog/p16022coll230:1420