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Topic
- Rivers--Oregon 74
- Dams 51
- Canals 16
- Flood control 9
- Fishways 6
- Salmon 6
- Fish screens 4
- Irrigation 4
- Sawmills 4
- Fishes--Conservation 3
- Power-plants 3
- Rowboats 3
- Inland water transportation 2
- Lectures and lecturing 2
- Oregon Wildlife Federation 2
- Waterfalls 2
- Boats 1
- Bridges 1
- Hydroelectric power plants 1
- Izaak Walton League of America 1
