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Topic
- National parks and reserves 7
- Hunting 3
- Swans 3
- Elk 2
- Marmots 2
- Motion pictures 2
- Nature films 2
- Osprey 2
- Wildlife refuges 2
- Woodchuck 2
- Bears 1
- Birds--Conservation 1
- Birds--Nests 1
- Eagles 1
- Geese 1
- Izaak Walton League of America 1
- Natural history museums 1
- Rivers--Oregon 1
- Travertine 1
- Turkey vulture 1
