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- Rivers 439
- Bodies of water 289
- Northwest, Pacific 209
- Photography 200
- Explorers 182
- Discovery and exploration 139
- West (U.S.) 99
- Canada, Western 91
- Riparian areas 65
- Rapids 53
- Mountains 51
- River engineering 44
- Aerial photographs 36
- Inland navigation 35
- River surveys 35
- Transportation 33
- United States. Congress--Records and correspondence 32
- Water resources development 32
- Canals--Design and construction--Costs 29
- Dams--Design and construction 29