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Institution
Collection
Format
Subject
502
Groundwater
363
Water quality
254
Aquifers
242
Outdoor recreation
206
Stream measurements
192
Hydrogeology
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149
Geology
149
Groundwater flow
140
Hydrology
137
Water-supply
116
Motor vehicles Recreational use
110
Groundwater Pollution
103
Water Pollution
93
Groundwater Quality
93
Streamflow
88
Floods
78
Trails
76
Forest roads
72
Roads
63
Groundwater flow Mathematical models
59
Water table
50
Flood forecasting
50
Recreation areas
44
Geology, Stratigraphic
43
Water chemistry
39
Nutrient pollution of water
36
Runoff
36
Water resources development
32
Automobile driving
30
Sediment transport
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Author
2,012
Geological Survey (U.S.)
490
United States. Central Intelligence Agency
154
United States. Forest Service,
117
National Water-Quality Assessment Program (U.S.)
97
United States. National Park Service
95
United States. Forest Service
more ...
89
United States. Bureau of Land Management
74
United States. Environmental Protection Agency
60
Geometronics Service Center (U.S.)
59
United States. National Aeronautics and Space Administration
41
United States. Bureau of Reclamation
38
United States. Forest Service. Pacific Northwest Region
37
United States. Department of Energy
36
United States. Forest Service. Southern Region
34
Geological Survey (U.S.). Water Resources Division
32
United States. Forest Service. Intermountain Region
30
Geological Survey (U.S.),
30
United States. Army. Corps of Engineers
29
Planetary Geology and Geophysics Program (U.S.)
28
United States. Bureau of Land Management,
27
United States. Forest Service. Southwestern Region
26
U.S. Fish and Wildlife Service
25
United States. Forest Service. Rocky Mountain Region
24
United States. National Park Service,
20
United States. Forest Service. Pacific Northwest Region,
19
Southwest Florida Water Management District (Fla.)
19
Washington (State). Department of Ecology
16
United States. Bureau of Indian Affairs
16
United States. Federal Highway Administration
16
United States. National Oceanic and Atmospheric Administration
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Language
Genre
1,702
Maps
119
Road maps
90
Topographic maps
79
Thematic maps
56
Tourist maps
53
Atlases
more ...
46
Remote-sensing maps
35
Handbooks and manuals
35
Physical maps
35
Remote-sensing images
33
Periodicals
27
Statistics
24
Bibliographies
22
Catalogs
21
Conference papers and proceedings
19
Geological maps
18
Technical reports
16
Congresses
10
Directories
10
Guidebooks
10
Outline maps
8
Bathymetric maps
8
Graphs
8
Serial publications
7
Databases
7
Index maps
6
Indexes
6
Quadrangle maps
5
Charts, diagrams, etc
4
Aerial views
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Literary Form
Era
8
Pre-Quaternary
7
Cretaceous
7
Paleozoic
7
Quaternary
3
Cambrian
3
Mesozoic
more ...
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
1990
1
20th century
1
Eocene
1
Flood, 1984-85
1
Jurassic
1
Miocene
1
Pennsylvanian
1
Precambrian
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Region
341
United States
170
Colorado
158
California
121
Oregon
120
Washington (State)
114
Florida
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103
New Mexico
88
Arizona
85
Nevada
81
Utah
72
Wyoming
68
New York (State)
66
Texas
65
Idaho
64
Kansas
61
North Carolina
54
Massachusetts
54
Montana
53
Tennessee
53
Wisconsin
49
Alaska
48
Minnesota
47
Ohio
46
Illinois
45
Georgia
43
Pennsylvania
41
Missouri
38
Puerto Rico
38
South Dakota
36
Arkansas
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Call Number
Year of Publication