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Institution
Collection
Format
Subject
1,963
Groundwater
1,910
Water quality
991
Aquifers
972
Hydrogeology
723
Stream measurements
668
Groundwater flow
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583
Groundwater Pollution
562
Groundwater Quality
547
Water-supply
503
Hydrology
440
Streamflow
421
Water Pollution
275
Floods
268
Water table
240
Groundwater flow Mathematical models
194
Nutrient pollution of water
188
Flood forecasting
156
Water resources development
155
Pesticides Environmental aspects
152
Water levels
146
Runoff
145
Suspended sediments
143
Sediment transport
142
Water quality Measurement
133
Geology
128
Water consumption
127
Water quality management
115
River sediments
111
Groundwater flow Computer simulation
107
Coal mines and mining Environmental aspects
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Author
4,646
Geological Survey (U.S.)
4,424
Geological Survey (U.S.),
449
National Water-Quality Assessment Program (U.S.)
277
United States. Environmental Protection Agency
233
United States. Department of Energy
202
United States. Bureau of Reclamation
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175
United States. Bureau of Land Management
134
United States. National Park Service
133
United States. Army. Corps of Engineers
125
Southwest Florida Water Management District (Fla.)
94
Washington (State). Department of Ecology
85
South Florida Water Management District (Fla.)
83
Arkansas Soil and Water Conservation Commission
77
New York (State). Department of Environmental Conservation
77
United States. Bureau of Indian Affairs
77
United States. Department of Energy. Nevada Operations Office
76
New Jersey. Department of Environmental Protection
74
Florida. Department of Environmental Regulation
74
U.S. Fish and Wildlife Service
66
United States. Federal Highway Administration
66
Wisconsin. Department of Natural Resources
60
Minnesota. Department of Natural Resources
53
Nassau County (N.Y.). Department of Public Works
50
Geological Survey (U.S.). Water Resources Division
50
Puerto Rico Aqueduct and Sewer Authority
49
Arkansas Geological Commission
47
Arizona. Department of Water Resources
47
California. Department of Water Resources
47
Miller, Todd S.,
46
Wyoming. State Engineer's Office
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Language
Genre
766
Maps
64
Statistics
39
Technical reports
24
Handbooks and manuals
22
Bibliographies
20
Bathymetric maps
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20
Databases
13
Conference papers and proceedings
12
Geographic information systems
7
Remote-sensing maps
6
Dictionaries
6
Geological maps
5
Academic theses
5
Congresses
5
Government publications
5
Thematic maps
3
Atlases
3
Gazetteers
3
Periodicals
3
Remote-sensing images
2
Drawings
2
Graphs
2
Observations
2
Online resources
2
Programmed instructional materials
2
Software
2
Surveys
2
Topographic maps
1
Abstracts
1
Administrative regulations
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Literary Form
Era
Region
583
Florida
490
California
378
New York (State)
354
Colorado
290
Washington (State)
265
Nevada
more ...
260
Texas
247
Pennsylvania
246
Minnesota
227
United States
223
New Mexico
218
Arizona
212
Kansas
209
Wisconsin
208
New Jersey
193
Tennessee
191
Montana
187
Idaho
187
Ohio
183
Wyoming
173
Oregon
164
North Carolina
152
Massachusetts
150
Arkansas
144
South Carolina
141
Puerto Rico
138
Mississippi
137
Illinois
131
Kentucky
130
Missouri
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