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Subject
Inland Waters
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33
Hydrology
25
Environment
16
Geoscientific Information
4
Rivers
4
Canals
3
Economy
3
Floods
3
Lakes
3
Transportation
3
Biota
2
Dams
2
Farming
2
Health
2
Hydraulic structures
2
Society
2
Streams
2
Wastewater
2
Bridges
1
Climatology, Meteorology, And Atmosphere
1