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Subject
- Rivers, creeks, streams, etc[remove]372
- Hydrographic surveying263
- Navigation improvements244
- Cost155
- Channels (Hydraulic engineering)132
- Dredging99
- Watersheds80
- United States Geological Survey Water-supply Paper64
- Dams63
- Stream measurements61
- Streamflow59
- Water and water supply53
- Locks (Hydraulic engineering)50
- Flood control45
- Harbors and ports35
- Water levels25
- Construction23
- Canals22
- Reservoirs22
- Floods21