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Creator
- United States. War Department 134
- United States. Army. Office of the Chief of Engineers 106
- Fisk, W. L. (Walter Leslie), 1855- 76
- Harts, W. W. (William Wright), 1866-1961 76
- United States. Department of the Interior 27
- United States. Bonneville Power Administration 25
- United States. Army. Corps of Engineers 15
- Elliott, T. C. (Thompson Coit), 1862-1943 9
- Rosenthal, Abraham, 1870-1929 7
- Warren, George C., 1877- 7
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Topic
- Northwest, Pacific 508
- Bodies of water 270
- Rivers 214
- River engineering 211
- Photography 155
- United States. Congress--Records and correspondence 135
- West (U.S.) 107
- Riparian areas 71
- Railroad engineering 47
- Mountains 46
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 221
- Oregon >> United States 191
- Willamette River >> Multnomah County >> Oregon >> United States 184
- Columbia River >> Douglas County >> Washington >> United States 179
- Washington >> United States 110
- Snake River >> British Columbia >> Canada 77
- Yamhill River >> Yamhill County >> Oregon >> United States 77
- Cascade Locks >> Hood River County >> Oregon >> United States 76
- Snake River >> Franklin County >> Washington >> United States 49
- Chehalis River >> Grays Harbor County >> Washington >> United States 29
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Type
- Text 335
- Image 145
- Collection 28
Format
- image/jpeg 356
- image/tiff 98
- application/xml 28
- application/pdf 26