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- Harbors 61
- River engineering 31
- United States. Congress--Records and correspondence 31
- Docks 23
- Bodies of water 21
- Northwest, Pacific 20
- River surveys 19
- Rivers 19
- Ships 19
- Grain elevators 14
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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
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- Coos Bay >> Coos County >> Oregon >> United States 11
- California >> United States 10
- Port of Portland - Marine - Terminal 4 >> Multnomah County >> Oregon >> United States 10
- San Francisco Bay >> San Mateo County >> California >> United States 6
- Clearwater River >> Nez Perce County >> Idaho >> United States 5
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Institution
- University of Oregon 61