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Subject
- Rivers193
- Law and legislation76
- Harbors36
- Waterways27
- Inland navigation26
- Navigation23
- Water resources development21
- United States. Army. Corps of Engineers19
- Flood control18
- Appropriations and expenditures17
- Maritime law13
- Recreational use12
- Environmental aspects10
- Wild and scenic rivers9
- Regulation8
- Public works7
- Streamflow7
- Canals5
- History5
- Water quality5