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Topic
- Bodies of water 12
- River engineering 12
- River surveys 12
- Rivers 12
- United States. Congress--Records and correspondence 12
- Harbors 8
- River channels 8
- Northwest, Pacific 7
- West (U.S.) 5
- Canals 4
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Region
- Columbia River >> Douglas County >> Washington >> United States 12
- Oregon >> United States 12
- Washington >> United States 12
- Willamette River >> Multnomah County >> Oregon >> United States 12
- Snake River >> Franklin County >> Washington >> United States 7
- California >> United States 6
- San Francisco Bay >> San Mateo County >> California >> United States 3
- Umpqua River >> Douglas County >> Oregon >> United States 3
- Sacramento River >> Contra Costa County >> California >> United States 2
- San Diego River >> San Diego County >> California >> United States 2
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Decade
- 1870-1879 12