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Institution
Collection
Format
Subject
Author
5
Geological Survey (U.S.),
3
Fishel, David K.,
2
Chesapeake Bay Program (U.S.)
2
Fishel, David K.
2
Geological Survey (U.S.)
2
Langland, Michael J.
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2
Langland, Michael J.,
2
Pennsylvania. Bureau of Soil and Water Conservation
2
Susquehanna River Basin Commission
1
Cravotta, Charles A., III,
1
Galeone, Daniel G.,
1
McElroy, Thomas A.,
1
Pennsylvania. Bureau of State Parks
1
Pennsylvania. Bureau of Topographic and Geologic Survey
1
Penrod, Kathy A.,
1
Truhlar, Mark V.
1
Truhlar, Mark V.,
1
United States. National Park Service
1
Williams, Donald R.,
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