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Institution
Collection
Format
Subject
44
Geology
35
Water quality
31
Groundwater
20
Hydrogeology
16
Mines and mineral resources
14
Groundwater Pollution
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14
Water table
13
Geology, Stratigraphic
12
Groundwater Quality
11
Natural gas Geology
11
Stream measurements
11
Water-supply
9
Nutrient pollution of water
8
Hydrology
8
Streamflow
7
Aquifers
7
Groundwater flow
7
Water Pollution
6
Floods
6
Hazardous waste sites
6
Hydraulic fracturing Environmental aspects
6
Rivers
6
Water resources development
5
Coal
5
Coal Geology
5
Coal mines and mining Environmental aspects
5
Geophysical well logging
5
Natural gas
5
Pesticides Environmental aspects
5
Sediment transport
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Author
Geological Survey (U.S.),
21
Chester County Water Resources Authority
20
Sloto, Ronald A.,
14
Senior, Lisa A.,
14
United States. Environmental Protection Agency
11
Pennsylvania. Department of Environmental Protection
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9
Reed, Lloyd A.,
9
Susquehanna River Basin Commission
8
Pennsylvania. Bureau of Topographic and Geologic Survey
7
Schreffler, Curtis L.,
7
Slonecker, E. Terrence,
6
Barker, James L., 1936-
6
Fishel, David K.,
6
Pennsylvania. Bureau of Topographic and Geologic Survey,
6
Wood, Charles R.,
5
Conger, Randall W.,
5
Cravotta, Charles A., III,
5
Galeone, Daniel G.,
5
Koerkle, Edward H.,
5
Langland, Michael J.,
5
McManus, B. Craig,
5
Pennsylvania. Department of Environmental Resources
5
Pomeroy, John S., 1929-
5
Risser, Dennis W.,
5
United States. National Park Service
5
Wetzel, Kim L.,
4
Bascom, F. 1862-1945,
4
Drake, Avery Ala, 1927-
4
Epstein, Jack Burton, 1935-
4
Goode, Daniel J.,
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Language
Genre
Literary Form
Era
Region
Pennsylvania
24
Chester County
9
Bucks County
9
Maryland
8
New Jersey
8
New York (State)
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6
Allegheny County
5
Berks County
5
Fayette County
5
Lancaster County
5
Ohio
5
Somerset County
5
Susquehanna River Watershed
5
West Virginia
4
Conestoga River Watershed
4
Montgomery County
4
Susquehanna River
3
Adams County
3
Beaver County
3
Carbon County
3
Susquehanna River, West Branch
3
Tioga County
3
Washington County
3
York County
2
Bradford County
2
Butler County
2
Cambria County
2
Centre County
2
Clearfield County
2
Delaware
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Year of Publication