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Subject
- Rivers3,735
- Harbors310
- Law and legislation272
- Description and travel238
- Regulation235
- History223
- Water176
- Lakes175
- Inland navigation162
- Recreational use148
- Flood control144
- Water-supply144
- Water resources development130
- Environmental aspects125
- Water quality115
- Public works113
- Stream measurements112
- Canals106
- Pollution104
- Navigation99