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Institution
Collection
Format
Subject
30
Water quality
22
Hydrogeology
21
Groundwater
13
Groundwater flow
12
Groundwater Pollution
11
Groundwater Quality
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11
Water-supply
9
Nutrient pollution of water
9
Stream measurements
8
Hydrology
8
Water Pollution
7
Uranium ores
6
Streamflow
5
Geophysical well logging
5
Water quality Measurement
4
Agriculture Environmental aspects
4
Aquifers
4
Coal
4
Floods
4
Geology
4
Land use Environmental aspects
4
Pennsylvania
4
Pesticides Environmental aspects
4
Radioactive substances
4
Sediment transport
3
Bacterial pollution of water
3
Coal mines and mining Environmental aspects
3
Flood control
3
Geology, Stratigraphic
3
Mines and mineral resources
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Author
Geological Survey (U.S.)
20
Sloto, Ronald A.
14
Pennsylvania. Department of Environmental Protection
13
United States. Environmental Protection Agency
12
Chester County Water Resources Authority
9
Pennsylvania. Department of Environmental Resources
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9
Reed, Lloyd A.
6
Conger, Randall W.
6
Fishel, David K.
6
Koerkle, Edward H.
6
Langland, Michael J.
6
Pennsylvania. Bureau of Topographic and Geologic Survey
6
Senior, Lisa A.
6
Susquehanna River Basin Commission
5
Barker, James L., 1936-
5
Lietman, Patricia L.
5
Lindsey, Bruce D., 1962-
5
Reif, Andrew G.
5
Schreffler, Curtis L.
4
Hainly, Robert A.
4
Herb, William J.
4
Low, Dennis J.
4
Philadelphia (Pa.). Water Department
4
Sams, James I.
4
Wetzel, Kim L.
4
Witt, Emitt C.
3
Chester County (Pa.). Health Department
3
Delaware River Basin Commission
3
Epstein, Jack Burton, 1935-
3
Hippe, Daniel J.
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Language
Literary Form
Region
Pennsylvania
14
Chester County
11
Maryland
8
Bucks County
7
Lancaster County
5
Conestoga River Watershed
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5
Fayette County
5
New Jersey
5
United States
4
Carbon County
4
Montgomery County
4
Philadelphia
4
West Virginia
3
Adams County
3
Berks County
3
Lebanon County
2
Brandywine Creek Watershed (Pa. and Del.)
2
Cumberland County
2
Indiana County
2
Lehigh County
2
New York (State)
2
Philadelphia Metropolitan Area
2
Schuylkill County
2
Schuylkill River Watershed
2
Somerset County
2
Susquehanna River Watershed
2
Susquehanna River, West Branch
2
Valley Forge National Historical Park
2
York County
1
Allegheny River (Pa. and N.Y.)
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Year of Publication