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Topic
- Bodies of water 11
- Harbors 11
- River engineering 11
- River surveys 11
- Rivers 11
- United States. Congress--Records and correspondence 11
- West (U.S.) 11
- River channels 7
- Rapids 3
- Canals 1
Region
- California >> United States 11
- Columbia River >> Douglas County >> Washington >> United States 11
- Oregon >> United States 11
- Washington >> United States 11
- Willamette River >> Multnomah County >> Oregon >> United States 11
- San Francisco Bay >> San Mateo County >> California >> United States 7
- Snake River >> Franklin County >> Washington >> United States 6
- Coos Bay >> Coos County >> Oregon >> United States 5
- San Diego River >> San Diego County >> California >> United States 5
- Clearwater River >> Nez Perce County >> Idaho >> United States 3
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