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- Hydrographic surveying[remove]6
- Congressionally-mandated reports4
- United States. War Dept3
- Cost2
- Navigation improvements2
- Rivers, creeks, streams, etc2
- United States. War Dept. Engineer Dept2
- Breakwaters1
- Canals1
- Channels (Hydraulic engineering)1
- Coastal engineering1
- Dams1
- Dikes (Engineering)1
- Document distribution1
- Federal aid1
- Government publications1
- Legislative resolutions1
- Locks (Hydraulic engineering)1
- Maintenance and repair1
- Piers1