Western Waters Digital Library
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Topic
- Northwest, Pacific 498
- Rivers 442
- Explorers 435
- Bodies of water 394
- Discovery and exploration 382
- River engineering 337
- Photography 272
- West (U.S.) 215
- Government publications 192
- United States. Congress--Records and correspondence 174
- United States--Appropriations and expenditures 121
- Canada, Western 108
- River surveys 108
- Rapids 76
- Riparian areas 72
- Mountains 57
- Transportation 53
- Railroad engineering 52
- Canals--Design and construction--Costs 44
- Inland navigation 43