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Subject
- Channels (Hydraulic engineering)[remove]167
- Hydrographic surveying116
- Navigation improvements115
- Cost89
- Rivers, creeks, streams, etc69
- Dredging62
- Harbors and ports35
- Flood control32
- Canals26
- Levees14
- Dams13
- Reservoirs13
- Construction12
- Piers12
- Floods10
- Water and water supply9
- Lakes8
- Legislative amendments8
- Locks (Hydraulic engineering)8
- Navigation8