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Creator
- United States. War Department 29
- Powell, Charles Francis, 1843-1907 5
- Smith, Katherine Louise 3
- United States. Army. Office of the Chief of Engineers 3
- Gillespie, G. L. 2
- Michler, N. (Nathaniel), 1827-1881 2
- United States. Congress. House 2
- United States. Department of the Interior 2
- Wilson, John M. (John Moulder), 1837-1919 2
- Doerksen, Harvey R. 1
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Topic
- Bodies of water 47
- Rivers 39
- River engineering 34
- United States. Congress--Records and correspondence 31
- Northwest, Pacific 30
- River surveys 29
- River channels 22
- Harbors 21
- West (U.S.) 17
- Canals 12
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Region
- Oregon >> United States 47
- Washington >> United States 40
- Columbia River >> Douglas County >> Washington >> United States 39
- Willamette River >> Multnomah County >> Oregon >> United States 35
- Snake River >> Franklin County >> Washington >> United States 25
- California >> United States 13
- Coos Bay >> Coos County >> Oregon >> United States 12
- Idaho >> United States 10
- San Francisco Bay >> San Mateo County >> California >> United States 7
- Clearwater River >> Nez Perce County >> Idaho >> United States 6
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License
- Creative Commons: Public Domain Mark 1.0 47
Type
- Text 47