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Topic
- Lectures and lecturing 354
- Rivers--Oregon 169
- Dams 116
- Hunting 92
- Wildlife refuges 80
- Salmon 75
- Water--Pollution 74
- Birds--Conservation 54
- Fishes--Conservation 52
- Izaak Walton League of America 45
- Bears 42
- Motion pictures 42
- Ducks 41
- Nature films 41
- Conservation of natural resources 39
- Flood control 35
- Herons 31
- Fishing 28
- Oregon Wildlife Federation 28
- Birds--Nests 25