Subject
- Anadromous fishes -- Oregon -- John Day River2
- Fishes -- Habitat -- Conservation -- Oregon -- John Day River2
- Wildlife habitat improvement -- Oregon -- John Day River2
- Anadromous fishes -- Habitat -- Oregon -- John Day River1
- Anadromous fishes -- Oregon -- Effect of habitat modification on1
- Fishery resources -- Oregon -- John Day River Basin -- Economic aspects1
- John Day River Watershed (Or.) -- Economic conditions1
- Steelhead (Fish) -- Habitat -- Oregon -- John Day River1
- Steelhead (Fish) -- Migration -- Oregon -- John Day River1