1900. 2011-12-12T21:28:41Z. 2022-03-29T20:39:35Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Maryland, Pennsylvania, and West Virginia.
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1900. 2011-12-12T21:28:45Z. 2022-03-29T20:39:36Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Maryland, Pennsylvania, and West Virginia.
1900. 2013-03-13T17:54:31Z. 2022-07-11T16:33:25Z. Campbell, Marius Robinson, 1858-1940. U.S. Geological Survey. English. Public. West Virginia, Ohio, Lawrence County, États-Unis, and Virginie-occidentale.
1900. 2012-07-03T14:18:39Z. 2012-07-11T15:21:00Z. U.S. Geological Survey. English. Public. Maryland, Garrett County (Md.), West Virginia, Preston County (W. Va.), Grant County (W. Va.), and Mineral County (W. Va.).
1900. 2012-06-29T14:08:07Z. 2017-05-09T13:36:39Z. U.S. Geological Survey. English. Public. Maryland, Washington County (Md.), Allegany County (Md.), West Virginia, Morgan County (W. Va.), Hampshire County (W. Va.), Pennsylvania, Bedford County (Pa.), and Fulton County (Pa.).
1900. 2011-12-12T21:28:48Z. 2022-03-29T20:39:36Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Maryland and West Virginia.
1900. 2011-12-12T21:28:49Z. 2022-03-29T20:39:36Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Maryland, Pennsylvania, and West Virginia.