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Institution
Collection
Format
Subject
502
Groundwater
356
Water quality
259
Aquifers
249
Outdoor recreation
194
Stream measurements
193
Hydrogeology
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170
Geology
149
Groundwater flow
141
Hydrology
138
Water-supply
117
Motor vehicles Recreational use
106
Groundwater Pollution
102
Water Pollution
90
Groundwater Quality
90
Streamflow
89
Floods
79
Trails
76
Forest roads
72
Roads
62
Groundwater flow Mathematical models
58
Water table
52
Geology, Stratigraphic
51
Recreation areas
49
Flood forecasting
43
Water chemistry
38
Nutrient pollution of water
36
Runoff
35
Water resources development
34
Mars (Planet)
32
Automobile driving
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Author
2,216
Geological Survey (U.S.)
538
United States. Central Intelligence Agency
153
United States. Forest Service,
121
United States. Forest Service
111
National Water-Quality Assessment Program (U.S.)
99
United States. National Park Service
more ...
90
United States. Bureau of Land Management
76
United States. National Aeronautics and Space Administration
74
United States. Environmental Protection Agency
61
Geometronics Service Center (U.S.)
41
United States. Bureau of Reclamation
38
United States. Department of Energy
38
United States. Forest Service. Pacific Northwest Region
37
United States. Forest Service. Southern Region
32
United States. Forest Service. Intermountain Region
31
Geological Survey (U.S.). Water Resources Division
30
Planetary Geology and Geophysics Program (U.S.)
30
United States. Army. Corps of Engineers
29
Geological Survey (U.S.),
28
United States. Forest Service. Southwestern Region
27
United States. Bureau of Land Management,
27
United States. National Park Service,
25
U.S. Fish and Wildlife Service
25
United States. Forest Service. Rocky Mountain Region
21
United States. Forest Service. Pacific Northwest Region,
20
Southwest Florida Water Management District (Fla.)
19
Washington (State). Department of Ecology
18
Planetary Geology Program (U.S.)
18
United States. National Oceanic and Atmospheric Administration
17
United States. Bureau of Indian Affairs
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Language
Genre
1,985
Maps
223
Topographic maps
119
Road maps
79
Thematic maps
64
Remote-sensing maps
62
Tourist maps
more ...
58
Atlases
46
Indexes
46
Remote-sensing images
39
Physical maps
37
Handbooks and manuals
36
Periodicals
33
Index maps
28
Statistics
24
Bibliographies
24
Quadrangle maps
23
Catalogs
21
Conference papers and proceedings
20
Geological maps
19
Photogrammetric maps
16
Congresses
14
Technical reports
13
Graphs
10
Bathymetric maps
10
Directories
10
Outline maps
9
Charts, diagrams, etc
8
Guidebooks
7
Databases
7
Serial publications
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Literary Form
Era
11
Quaternary
8
Cretaceous
8
Paleozoic
8
Pre-Quaternary
4
Mesozoic
3
Cambrian
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3
Ordovician
3
Partition, 1995
3
Tertiary
2
Cenozoic
2
Mississippian
2
Pleistocene
2
Silurian
1
1794-1858
1
1862-1877
1
1934-
1
1945-
1
1959-1990
1
1990
1
20th century
1
Eocene
1
Flood, 1984-85
1
Jurassic
1
Miocene
1
Pennsylvanian
1
Precambrian
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Region
316
United States
177
Colorado
168
California
128
Washington (State)
125
Oregon
121
Florida
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104
New Mexico
93
Arizona
87
Nevada
80
Utah
75
Wyoming
74
Texas
73
New York (State)
71
Idaho
66
Kansas
66
Missouri
61
North Carolina
60
Montana
55
Tennessee
55
Wisconsin
53
Alaska
52
Massachusetts
50
Illinois
50
Ohio
49
Minnesota
48
Georgia
43
Mars (Planet)
43
Pennsylvania
39
Arkansas
39
South Dakota
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Call Number
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