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Subject
- Birds[remove]11
- Biology--Fieldwork6
- Mammals5
- Zoological surveys5
- Bird populations4
- Scientific expeditions3
- Zoological specimens3
- Animal populations2
- Birds--Ecology2
- Voyages and travels2
- Amphibians1
- Animal diversity1
- Animal traps1
- Animals--Identification1
- Art1
- Artists1
- Artists' preparatory studies1
- Bird trapping1
- Birds--Behavior1
- Cassin's finch1