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- Bodies of water 7
- Northwest, Pacific 7
- Rivers 6
- Aerial photographs 5
- Dams 3
- Conservation of natural resources 2
- Maps 2
- Agriculture 1
- Cultural property 1
- Environmental policy 1
- Fisheries 1
- Forest conservation 1
- Landscape protection 1
- National parks and reserves 1
- Photography 1
- Recreation 1
- River engineering 1
- Salmon fisheries 1
- Salmon 1
- Transportation 1