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Institution
Collection
Format
Subject
51
Geology
42
Water quality
36
Groundwater
23
Hydrogeology
18
Groundwater Pollution
17
Mines and mineral resources
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17
Stream measurements
16
Water table
14
Geology, Stratigraphic
14
Groundwater Quality
14
Streamflow
14
Water-supply
13
Water Pollution
11
Natural gas Geology
10
Post office buildings
9
Floods
9
Groundwater flow
9
Historic sites
9
Nutrient pollution of water
9
Water resources development
8
Aquifers
8
Auditing
8
Geophysical well logging
8
Hazardous waste site remediation
8
Hazardous waste sites
8
Hydrology
8
Wages
7
Environmental monitoring
7
Historic sites Law and legislation
6
Coal Geology
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Author
256
Geological Survey (U.S.),
53
Geological Survey (U.S.)
29
Chester County Water Resources Authority
27
Pennsylvania. Department of Environmental Protection
21
United States. Environmental Protection Agency
20
Sloto, Ronald A.,
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17
United States,
15
United States. National Park Service
14
Senior, Lisa A.,
12
Susquehanna River Basin Commission
9
Pennsylvania. Bureau of Topographic and Geologic Survey
9
Reed, Lloyd A.,
8
United States. Bureau of Labor Statistics,
7
Schreffler, Curtis L.,
7
Senior, Lisa A.
7
Slonecker, E. Terrence,
7
Thornberry, Trista L.,
7
United States. Bureau of Mines
7
United States. Congress. House. Committee on Natural Resources,
7
United States. Environmental Protection Agency,
6
Barker, James L., 1936-
6
Fishel, David K.,
6
Pennsylvania. Bureau of Topographic and Geologic Survey,
6
Pomeroy, John S., 1929-
6
Sloto, Ronald A.
6
Wood, Charles R.,
5
Chester County (Pa.). Health Department
5
Conger, Randall W.,
5
Cravotta, Charles A., III,
5
Galeone, Daniel G.,
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Language
Genre
22
Periodicals
20
Maps
20
Statistics
16
Statutes and codes
12
Legislative hearings
10
Legislative materials
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4
Electronic government information
3
Case studies
3
Technical reports
2
Annual reports
2
Environmental impact statements
1
Bathymetric maps
1
Biographies
1
Census data
1
Databases
1
Handbooks and manuals
1
Nomenclature
1
Surveys
1
Topographic maps
1
Treaties
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Literary Form
Era
Region
Pennsylvania
34
Chester County
29
Philadelphia
19
United States
14
New York (State)
12
Maryland
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11
Allegheny National Forest
11
Pittsburgh
10
Bucks County
10
New Jersey
9
Ohio
9
West Virginia
8
Berks County
8
Delaware
8
Lancaster County
7
Allegheny County
7
Gettysburg National Military Park (Pa.)
6
Susquehanna River Watershed
5
Fayette County
5
Montgomery County
5
Somerset County
5
Susquehanna River
5
Susquehanna River, West Branch
5
Valley Forge National Historical Park
4
Allentown
4
Conestoga River Watershed
4
Gettysburg National Military Park
4
Hopewell Furnace National Historic Site (Pa.)
4
Johnstown Flood National Memorial (Pa.)
4
Philadelphia Region
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Call Number
42
K - Law
33
A - General Works
27
E - United States History
15
G - Geography, Anthropology, Recreation
12
H - Social Science
12
J - Political Science
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9
V - Naval Science
8
L - Education
8
Q - Science
6
S - Agriculture
5
P - Language and Literature
4
T - Technology
3
C - Historical Sciences
3
D - World History
2
F - General American History
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Year of Publication