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- Bodies of water 12
- Northwest, Pacific 12
- Rivers 12
- Aerial photographs 11
- Roads 10
- Dams 4
- Oregon--Maps 3
- Universities and colleges 2
- Universities and colleges--Finance 2
- Conservation of natural resources 1
- Industrialization 1
- Landscape protection 1
- Maps 1
- National parks and reserves 1
- Natural areas 1
- Oregon State College 1
- Oregon State University 1
- Public universities and colleges 1
- Riparian areas 1
- River surveys 1