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- Wildlife refuges 13
- Birds--Conservation 9
- Agriculture 4
- Hunting 3
- Fishing 2
- Lakes--California 2
- Lakes--Oregon 2
- United States. Bureau of Biological Survey 2
- Waterfowl 2
- American Game Association 1
- Beavers 1
- California Oregon Power Company 1
- Caprimulgidae 1
- Chickadees 1
- Ducks 1
- Elk 1
- Lectures and lecturing 1
- Mountains--Oregon 1
- Muskrat 1
- Nighthawks 1
