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- Harbors 22
- River engineering 22
- River surveys 22
- United States. Congress--Records and correspondence 22
- Bodies of water 21
- Rivers 21
- River channels 14
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Region
- Columbia River >> Douglas County >> Washington >> United States 22
- Oregon >> United States 22
- Washington >> United States 22
- Willamette River >> Multnomah County >> Oregon >> United States 22
- Snake River >> Franklin County >> Washington >> United States 16
- California >> United States 12
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- San Francisco Bay >> San Mateo County >> California >> United States 7
- San Diego River >> San Diego County >> California >> United States 6
- Clearwater River >> Nez Perce County >> Idaho >> United States 5
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Type
- Text 21
- Collection 1