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- Rivers--Oregon 32
- Boats 7
- Dams 6
- Waterfalls 5
- Springs 3
- Bridges 2
- Brown, W. S. (Walter Sheldon), 1878- 2
- Hydroelectric power plants 2
- Picnics 2
- Portraits, Group 2
- Power-plants 2
- Rapids 2
- Sawmills 2
- Universities and colleges--Faculty 2
- Bears 1
- Fishways 1
- Forests and forestry 1
- Inland water transportation 1
- Izaak Walton League of America 1
- Lectures and lecturing 1
