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Creator
- United States. Army. Office of the Chief of Engineers 393
- Freeman, Lewis R. (Lewis Ransome), 1878- 229
- Lorraine, Madison Johnson 225
- United States. War Department 173
- Fisk, W. L. (Walter Leslie), 1855- 75
- Harts, W. W. (William Wright), 1866-1961 75
- United States. Department of the Interior 32
- United States. Bonneville Power Administration 30
- Oregon Touring Bureau 27
- Elliott, T. C. (Thompson Coit), 1862-1943 10
- Rosenthal, Abraham, 1870-1929 6
- Warren, George C., 1877- 6
- Powell, Charles Francis, 1843-1907 5
- United States. War Department. Office of the Chief of Engineers 5
- Pond, James B. (James Burton), 1889-1961 4
- Smith, Katherine Louise 3
- United States. Bureau of Reclamation 3
- Wilson, John M. (John Moulder), 1837-1919 3
- Gibson, Charles R. (Charles Robert), 1870-1931 2
- Gillespie, G. L. 2