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- Bodies of water 788
- Rivers 313
- Northwest, Pacific 270
- West (U.S.) 159
- Photography 132
- Trees 118
- River engineering 115
- Ships 109
- Explorers 88
- Riparian areas 67
- Discovery and exploration 59
- Mountains 56
- Buildings 53
- Oregon--History 53
- Docks 52
- Masts and rigging 51
- Boats and boating 49
- Railroad engineering 49
- Tipis 47
- Harbors 44
