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- Dams 68
- Rivers--Oregon 67
- Flood control 31
- Fishes--Conservation 21
- Salmon 21
- Lectures and lecturing 18
- Inland water transportation 9
- Irrigation 5
- Water--Pollution 5
- Oregon Audubon Society 4
- Conservation of natural resources 3
- Izaak Walton League of America 2
- Oregon Wildlife Federation 2
- Pacific College (Newberg, Or.) 2
- Arboretums 1
- Bandon, Eliza 1
- Birdhouses 1
- Bodies of water 1
- Electric power production 1
- Finley, William L. (William Lovell), 1876-1953 1