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Topic
- Bodies of water 18
- Northwest, Pacific 12
- Rivers 12
- Aerial photographs 11
- Dams 4
- Mooring of ships 4
- Ships 4
- Buildings 2
- Cattle 2
- Livestock 2
- Ships--Launching 2
- Trees 2
- Conservation of natural resources 1
- Industrialization 1
- Landscape protection 1
- Maps 1
- National parks and reserves 1
- Natural areas 1
- Riparian areas 1
- River surveys 1