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Creator
- United States. Army. Office of the Chief of Engineers 406
- Freeman, Lewis R. (Lewis Ransome), 1878- 230
- Lorraine, Madison Johnson 225
- United States. War Department 179
- Fisk, W. L. (Walter Leslie), 1855- 76
- Harts, W. W. (William Wright), 1866-1961 76
- United States. Department of the Interior 33
- United States. Bonneville Power Administration 31
- Oregon Touring Bureau 28
- United States. Army. Corps of Engineers 15
- Elliott, T. C. (Thompson Coit), 1862-1943 11
- Rosenthal, Abraham, 1870-1929 7
- Warren, George C., 1877- 7
- United States. War Department. Office of the Chief of Engineers 6
- Pond, James B. (James Burton), 1889-1961 5
- Powell, Charles Francis, 1843-1907 5
- United States. Agricultural Stabilization and Conservation Service 5
- Smith, Katherine Louise 4
- Gibson, Charles R. (Charles Robert), 1870-1931 3
- Kinney, M. J. H. 3