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Topic
- Wildlife refuges 41
- Birds--Conservation 23
- Lectures and lecturing 14
- Herons 10
- Hunting 10
- Lakes--Oregon 6
- Rivers--Oregon 6
- Waterfowl 5
- Ducks 4
- Grebes 4
- Agriculture 3
- Dams 3
- Feathers 3
- Pelicans 3
- Water--Pollution 3
- Wildlife conservation 3
- Birds--Conservation--Law and legislation 2
- Conservation of natural resources 2
- Coyote 2
- Fishing 2