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- Scientific expeditions 8
- Bears 5
- Finley, William L. (William Lovell), 1876-1953 5
- Rivers--Oregon 5
- Salmon 3
- Water--Pollution 3
- Gulls 2
- Hunting 2
- Migratory birds 2
- Waterfowl 2
- Wildlife conservation 2
- Wildlife refuges 2
- Auks 1
- Beavers 1
- Dams 1
- Degrees, Academic 1
- Indians of North America 1
- Inland water transportation 1
- Islands--Alaska 1
- Lakes--California 1