1945. 2012-07-24T14:56:00Z. 2021-03-18T19:14:49Z. Geological Survey (U.S.). The Survey. English. Public. Maryland. and Pennsylvania.
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2. Williamsport quadrangle, Maryland-West Virginia-Pennsylvania, 1944 : 15 minute series (topographic)
1965. 2012-07-25T19:47:07Z. 2022-07-11T15:14:30Z. Geological Survey (U.S.). The Survey. English. Public. Maryland., West Virginia., and Pennsylvania.
