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- Rivers 172
- Trees 172
- Landscapes 48
- Nature 37
- Bridges 34
- Rocks 34
- Columbia River 27
- Forests and forestry 18
- Roads 16
- Slash (Logging) 15
- Buildings 13
- Dams--Design and construction 13
- Riparian areas 13
- Cliffs 12
- Mountains 12
- Waterfalls 12
- Construction equipment 11
- Dirt roads 11
- Electric lines 10
- Willamette River (Or.) 10