Subject
Water resources development
1,369
Water resources development Law and legislation
450
Water-supply
355
Federal aid to water resources development
228
Water resources development Finance Law and legislation
226
Appropriations and expenditures
186
Water-supply Management
136
Groundwater
129
Energy development Law and legislation
128
Hydrology
104
Water resources development Environmental aspects
98
Water rights
92
Water quality
80
Water resources development Finance
80
Water resources development Government policy
75
Federal aid to energy development
65
Water quality management
56
Watershed management
55
Flood control Law and legislation
52
Water use
48
Water resources development Economic aspects
47
Hydroelectric power plants Law and legislation
46
Irrigation
41
Water resources development History
38
Water Law and legislation
35
Water-supply, Rural
34
Environmental engineering
33
River engineering
32
Stream measurements
32
Dredging
31
Hydroelectric power plants Licenses
31
Hydrology Research
31
Water-supply Law and legislation
31
Flood control
30
Water resources development Research
30
Sustainable development
29
Climatic changes
28
Water resources development Planning
28
Infrastructure (Economics)
27
Water Storage
27
Public works Finance Law and legislation
26
Water conservation
26
Colorado River Watershed (Colo.-Mexico)
25
Energy development Finance
25
Rules and practice
25
Aquifers
24
History
24
Mines and mineral resources
24
Groundwater Quality
22
Water Pollution
22
more ...