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Subject
400
Water quality
335
Groundwater
308
Geology
264
Mines and mineral resources
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Geology, Stratigraphic
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Geochemical prospecting
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Groundwater Quality
146
Geochemistry
143
Earthquakes
143
Groundwater Pollution
128
Stream measurements
124
Hydrology
117
Borings
115
Ore deposits
101
Hydrogeology
89
Petroleum Geology
88
Water-supply
80
Seismology
79
Geology, Structural
79
Water Pollution
74
Groundwater flow
71
Water resources development
70
Faults (Geology)
63
Seismic prospecting
60
Drill cores
60
Earthquake hazard analysis
59
Gold ores
57
Sedimentation and deposition
57
Sediments (Geology)
56
River sediments
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Author
5,296
Geological Survey (U.S.)
102
United States. Department of Energy. Nevada Operations Office
80
United States. Department of Energy
65
United States. Environmental Protection Agency
57
Saudi Arabia. Deputy Ministry for Mineral Resources
53
Bullock, John H.
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53
United States. Bureau of Land Management
46
United States. Bureau of Reclamation
38
Adrian, Betty M.
37
Indiana. Department of Transportation
35
Missouri. Division of Geology and Land Survey
30
Voelker, David C.
29
Kansas Geological Survey
29
McHugh, John B.
29
National Regional Aquifer Systems Analysis Program (U.S.)
28
National Water-Quality Assessment Program (U.S.)
28
Robinson, Bret A.
28
United States. Army. Corps of Engineers
27
Miller, Robert L. 1941-
25
United States. Bureau of Mines
24
Arkansas Soil and Water Conservation Commission
24
Desborough, George A.
24
United States. National Park Service
23
Day, Gordon W.
23
United States. Agency for International Development
22
United States. Bureau of Indian Affairs
21
Erickson, M. S.
21
Nash, J. Thomas 1941-
19
Bethke, Philip Martin, 1930-
19
Hays, Walter W.
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Genre
156
Maps
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Bibliographies
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Conference papers and proceedings
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Statistics
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Congresses
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Catalogs
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Technical reports
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Guidebooks
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Geographic information systems
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Software
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Directories
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Abstracts
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Aerial photographs
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Bathymetric maps
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Electronic government information United States
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Remote-sensing images
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Topographic maps
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Academic theses
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Dictionaries
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Surveys
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Charts, diagrams, etc
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Code numbers
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Computer files
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Literary Form
Era
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Cenozoic
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Cretaceous
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Paleozoic
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Pliocene
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Quaternary
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Tertiary
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Miocene
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Mesozoic
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Precambrian
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Holocene
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Pleistocene
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Jurassic
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Oligocene
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Pennsylvanian
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Permian
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Proterozoic
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Mississippian
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Eocene
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Neogene
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Ordovician
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Paleocene
4
Paleogene
4
Triassic
3
Carboniferous
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Silurian
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Archaean
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Devonian
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Earthquake, 1987
1
1743-1826
1
Cambrian
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Region
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California
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Alaska
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Arizona
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Saudi Arabia
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48
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Nye County
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Pennsylvania
44
New York (State)
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Virginia
40
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