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Subject
- Floods260
- Flood forecasting60
- Stream measurements51
- Paleontology37
- Streamflow36
- Geology33
- Groundwater31
- Water27
- Water quality26
- Geology, Stratigraphic21
- Groundwater flow20
- Paleobotany20
- Floodplains18
- Foraminifera, Fossil18
- Fishes13
- Flood control13
- Sediment transport13
- Forests and forestry12
- Flood damage prevention11
- Aquifers10