Subject
- Zoological surveys19
- Mountain animals18
- Bighorn sheep17
- Birds--Habitat16
- Caribou16
- Flowers16
- Scientific expeditions--Equipment and supplies15
- Animal carcasses14
- Birds--Eggs14
- Voyages and travels14
- Whales14
- Lakes13
- Nests13
- Animals--Habitations12
- Bird populations12
- Mammals--Ecology12
- Rivers12
- Wild flowers12
- Animal traps11
- Forest animals11