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Topic
- River engineering 14
- River surveys 14
- Rivers 14
- Bodies of water 13
- United States. Congress--Records and correspondence 13
- River channels 9
- Harbors 8
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Region
- Columbia River >> Douglas County >> Washington >> United States 14
- Willamette River >> Multnomah County >> Oregon >> United States 14
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- Snake River >> Franklin County >> Washington >> United States 8
- California >> United States 6
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- Umpqua River >> Douglas County >> Oregon >> United States 3
- Coos Bay >> Coos County >> Oregon >> United States 2
- Sacramento River >> Contra Costa County >> California >> United States 2
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Decade
- 1870-1879 14