Subject
- Wolves--Ecology3
- World War (1914-1918)3
- Amateur films2
- Animal diversity2
- Animal migration--Climatic factors2
- Animal populations2
- Animal traps2
- Armed Forces2
- Art--Collectors and collecting2
- Artists--Correspondence2
- Authors, American2
- Authorship2
- Barred owl2
- Beavers2
- Beavers--Behavior2
- Beavers--Environmental aspects2
- Beavers--Habitat2
- Bighorn sheep--Diseases2
- Birds of prey2
- Birds--Ecology2