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Topic
- Wildlife refuges 80
- Birds--Conservation 44
- Lectures and lecturing 20
- Hunting 11
- Agriculture 9
- Waterfowl 9
- Rivers--Oregon 8
- Wildlife management 6
- Lakes--Oregon 5
- Water--Pollution 5
- Conservation of natural resources 4
- Lakes--California 4
- Salmon 4
- Bears 3
- Dams 3
- Fishing 3
- National parks and reserves 3
- United States. Bureau of Biological Survey 3
- Wildlife conservation 3
- Antelopes 2
