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Topic
- Harbors 36
- River engineering 31
- United States. Congress--Records and correspondence 31
- Bodies of water 21
- Northwest, Pacific 20
- River surveys 19
- Rivers 19
- River channels 14
- West (U.S.) 11
- Canals 6
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Region
- Washington >> United States 30
- Columbia River >> Douglas County >> Washington >> United States 20
- Willamette River >> Multnomah County >> Oregon >> United States 20
- Oregon >> United States 19
- Snake River >> Franklin County >> Washington >> United States 15
- Coos Bay >> Coos County >> Oregon >> United States 11
- California >> United States 10
- San Francisco Bay >> San Mateo County >> California >> United States 6
- Clearwater River >> Nez Perce County >> Idaho >> United States 5
- Idaho >> United States 5
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License
- Creative Commons: Public Domain Mark 1.0 36
Format
- application/pdf 19
- image/jpeg 13
- image/tiff 4
Institution
- University of Oregon 36