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- Kelps 24
- Pacific Coast (Calif.) 24
- Bodies of water 13
- River engineering 13
- Rivers 13
- United States. Congress--Records and correspondence 13
- Harbors 12
- River surveys 12
- West (U.S.) 11
- River channels 8
- Rapids 3
- Canals 2
- Northwest, Pacific 2
- Forest rangers 1
- Forests and forestry 1
- Pacific Coast (Mexico) 1
- Portraits, Group 1
