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Topic
- Bears 22
- Lectures and lecturing 5
- Salmon 4
- Birds--Nests 2
- Gulls 2
- Rivers--Oregon 2
- Scientific expeditions 2
- Aleuts 1
- Auks 1
- Bald eagle 1
- Beavers 1
- Birds--Conservation 1
- Birds--Eggs 1
- Black bear 1
- Caribou 1
- Coasts--Oregon 1
- Cormorants 1
- Dams 1
- Degrees, Academic 1
- Ducks 1
