1905. 2013-03-14T15:33:38Z. 2013-03-14T15:33:38Z. Woolsey, Lester Hood, 1877-1961. The Survey. English. Public. Pennsylvania, Allegheny County, Beaver County, États-Unis, and arizona.
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1905. 2013-03-14T15:32:14Z. 2013-03-14T15:32:14Z. Butts, Charles, 1863-1946. The Survey. English. Public. Pennsylvania, Bedford County, Blair County, Cambria County, États-Unis, and Pennsylvanie.
1905. 2013-03-14T13:59:33Z. 2013-03-14T13:59:33Z. Stone, Ralph W. (Ralph Walter), 1876-1964. The Survey. English. Public. Pennsylvania, Armstrong County, Indiana County, Westmoreland County, États-Unis, and Pennsylvanie.
1905. 2011-12-12T21:36:17Z. 2022-03-29T20:40:33Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
1905. 2011-12-12T21:36:33Z. 2022-03-29T20:40:35Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Pennsylvania.
1905. 2013-03-14T14:03:48Z. 2021-09-27T17:33:04Z. Butts, Charles, 1863-1946. The Survey. English. Public. Pennsylvania, Armstrong County, Clarion County, États-Unis, and Pennsylvanie.
1905. 2011-12-12T21:36:39Z. 2022-03-29T20:40:35Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. New Jersey and Pennsylvania.
1905. 2011-12-12T21:28:52Z. 2022-03-29T20:39:37Z. Geological Survey (U.S.). U.S. Geological Survey. English. Public. Maryland and Pennsylvania.