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Topic
- Lectures and lecturing 102
- Rivers--Oregon 59
- Water--Pollution 34
- Dams 32
- Wildlife refuges 21
- Salmon 20
- Birds--Conservation 17
- Izaak Walton League of America 16
- Fishes--Conservation 12
- Hunting 7
- Oregon Wildlife Federation 7
- National Wildlife Federation 6
- Sewage disposal plants 6
- Bears 5
- Beavers 5
- Conservation of natural resources 5
- Conservation--Law and legislation 5
- Finley, William L. (William Lovell), 1876-1953 5
- Killer whale 5
- Scientific expeditions 5