Topic
- Lakes--Oregon 12
- Agriculture 11
- Birds--Conservation--Law and legislation 11
- Hummingbirds 11
- Owls 11
- Sparrows 11
- Chickadees 10
- Cormorants 10
- Dams 10
- Geese 10
- Lectures and lecturing 10
- Psaltriparus 10
- Wildlife management 10
- Fishes--Conservation 9
- Malheur National Wildlife Refuge (Or.) 9
- Bears 8
- National parks and reserves 8
- Trout 8
- Wrens 8
- Beavers 7