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Institution
Collection
Subject
46
Geology
35
Water quality
29
Coal
28
Historic sites
25
Mines and mineral resources
24
Groundwater
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22
Hydrogeology
21
Pennsylvania
14
Groundwater flow
14
Water-supply
13
Coal mines and mining
13
Geology, Stratigraphic
12
Groundwater Quality
12
Hydrology
12
National parks and reserves
11
Groundwater Pollution
11
Sediment transport
10
Water Pollution
9
Anthracite coal
9
Coal preparation
9
Nutrient pollution of water
9
Railroads History
9
Stream measurements
7
Allegheny National Forest (Pa.)
7
Aquifers
7
Delaware Water Gap National Recreation Area (N.J. and Pa.)
7
Natural gas
7
Paleontology
7
Water quality biological assessment
6
Coal Carbonization
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Author
155
Geological Survey (U.S.)
52
United States. National Park Service
30
United States. Bureau of Mines
22
Sloto, Ronald A.
20
Chester County Water Resources Authority
16
Reed, Lloyd A.
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14
Pennsylvania. Department of Environmental Protection
14
United States. Environmental Protection Agency
12
United States. Department of the Interior. Southwestern Pennsylvania Heritage Preservation Commission
11
America's Industrial Heritage Project
11
United States. National Park Service. Denver Service Center
10
Pennsylvania. Department of Environmental Resources
9
Reif, Andrew G.
9
United States. National Park Service,
8
Pennsylvania. Bureau of Topographic and Geologic Survey
7
Fishel, David K.
7
Senior, Lisa A.
7
Susquehanna River Basin Commission
7
U.S. Fish and Wildlife Service
6
Conger, Randall W.
6
Dowd, James J.
6
Historic American Buildings Survey/Historic American Engineering Record
6
Koerkle, Edward H.
6
Langland, Michael J.
6
Pennsylvania. Department of Transportation
6
Pomeroy, John S., 1929-
6
Schreffler, Curtis L.
6
United States. Forest Service. Eastern Region
6
Wolfson, D. E.
5
Barker, James L., 1936-
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Language
Genre
13
Maps
8
Statistics
5
Bibliographies
5
Periodicals
5
Tourist maps
3
Technical reports
more ...
2
Case studies
2
Gazetteers
2
Nomenclature
1
Aerial views
1
Catalogs
1
Directories
1
Exhibition catalogs
1
Geological maps
1
Guidebooks
1
Illustrated works
1
Mine maps
1
Video recordings
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Literary Form
Era
4
Ordovician
3
Cretaceous
3
Devonian
2
1761-1849
2
19th century
2
Cambrian
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2
Precambrian
2
Silurian
1
1732-1799
1
1736-1799
1
1748-1789
1
1789-1797
1
1797-1801
1
1890-1969
1
18th century
1
20th century
1
Civil War, 1861-1865
1
Dovanian
1
Mesozoic
1
Paleozoic
1
Pennsylvanian
1
Permian
1
Revolution, 1775-1783
1
Triassic
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Region
Pennsylvania
24
United States
23
Chester County
20
New Jersey
18
Philadelphia
12
Bucks County
more ...
12
Maryland
10
Lancaster County
9
Fayette County
9
West Virginia
8
Alaska
8
Delaware Water Gap National Recreation Area (N.J. and Pa.)
8
New York (State)
7
Allegheny County
7
Allegheny National Forest (Pa.)
7
Cambria County
7
Gettysburg National Military Park (Pa.)
6
Ohio
6
Somerset County
5
Conestoga River Watershed
5
Fort Necessity National Battlefield (Pa.)
5
Independence National Historical Park (Philadelphia, Pa.)
5
Montgomery County
5
Philadelphia Metropolitan Area
5
Pittsburgh
5
Scranton
5
Steamtown National Historic Site (Scranton, Pa.)
5
Washington County
5
York County
4
Adams County
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Call Number
74
T - Technology
70
Q - Science
47
G - Geography, Anthropology, Recreation
26
F - General American History
14
E - United States History
11
A - General Works
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10
H - Social Science
3
L - Education
3
N - Fine Arts
1
C - Historical Sciences
1
D - World History
1
K - Law
1
M - Music
1
P - Language and Literature
1
S - Agriculture
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Year of Publication