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- Truss bridges 8
- Rivers 6
- Waterways 4
- Oregon (Battleship) 3
- Ships 3
- Willamette River (Or.) 3
- Bridges 2
- Columbia River 2
- Paddle steamers 2
- Aerial photography 1
- Buildings 1
- Canoes and canoeing 1
- Cities and towns 1
- Columbia River Highway (Or.) 1
- Docks 1
