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Creator
- United States. War Department 25
- Powell, Charles Francis, 1843-1907 5
- United States. Army. Office of the Chief of Engineers 4
- Michler, N. (Nathaniel), 1827-1881 2
- Wilson, John M. (John Moulder), 1837-1919 2
- Gillespie, G. L. 1
- Jones, William A. (William Albert), 1841-1914 1
- Pacific Northwest Regional Planning Commission 1
Topic
- River surveys 31
- River engineering 29
- United States. Congress--Records and correspondence 27
- Bodies of water 26
- Rivers 26
- River channels 20
- Harbors 19
- Northwest, Pacific 14
- West (U.S.) 12
- Canals 10
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Region
- Washington >> United States 31
- Oregon >> United States 30
- Columbia River >> Douglas County >> Washington >> United States 26
- Willamette River >> Multnomah County >> Oregon >> United States 26
- Snake River >> Franklin County >> Washington >> United States 20
- Coos Bay >> Coos County >> Oregon >> United States 12
- California >> United States 10
- Clearwater River >> Nez Perce County >> Idaho >> United States 6
- Idaho >> United States 6
- San Francisco Bay >> San Mateo County >> California >> United States 6
- more »
Institution
- University of Oregon 31