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1913. 2010-08-26T14:28:08Z. 2021-10-12T21:33:29Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Gettysburg National Military Park (Pa.).
1919. 2010-08-31T16:38:03Z. 2022-03-22T21:48:28Z. Cope, Emmor B. s.n. English. Public. Gettysburg National Military Park (Pa.).