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Topic
- Lectures and lecturing 109
- Rivers--Oregon 77
- Dams 44
- Water--Pollution 41
- Salmon 26
- Wildlife refuges 22
- Izaak Walton League of America 20
- Fishes--Conservation 19
- Birds--Conservation 17
- Oregon Wildlife Federation 13
- Flood control 9
- Sewage disposal plants 9
- Bears 7
- Hunting 7
- National Wildlife Federation 7
- Poaching 7
- Agriculture 6
- Finley, William L. (William Lovell), 1876-1953 6
- Fishing 6
- Beavers 5
