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Subject
Inland Waters
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402
Rivers
170
Hydrology
111
Watersheds
100
Groundwater
70
Lakes
51
Groundwater flow
31
Bodies of water
30
Seas
25
Oceans
24
Coasts
22
Ocean
21
Seashore
21
Environment
11
Imagery and Base Maps
10
Biology and Ecology
9
Land cover
9
Boundaries
8
Geoscientific Information
8
Land use
7