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- Willamette River (Or.) 114
- Rivers 73
- Bridges 56
- Cities and towns 43
- Ships 23
- Cruisers (Warships) 18
- Buildings 17
- Historic bridges 13
- Iron and steel bridges 11
- Trees 11
- Docks 10
- Boats and boating 9
- Waterways 9
- Steel Bridge (Portland, Or.) 8
- Aerial photography 7
- Steamboats 7
- Water--Pollution 7
- Rivers--Oregon 6
- Roads 6
- American wit and humor, Pictorial 5