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Creator
- Henderson, Robert W. (Robert Wesley), 1914-2006 445
- United States. War Department 51
- Oregon State University. Agricultural Experiment Station 44
- Oregon Touring Bureau 27
- United States. Department of the Interior 8
- United States. Bonneville Power Administration 6
- Pond, James B. (James Burton), 1889-1961 5
- Powell, Charles Francis, 1843-1907 5
- Smith, Katherine Louise 4
- Gibson, Charles R. (Charles Robert), 1870-1931 3
- Kinney, M. J. H. 3
- Ballou, William Hosea, 1857-1937 2
- Gillespie, G. L. 2
- Michler, N. (Nathaniel), 1827-1881 2
- Shaw, Emma 2
- United States. Bureau of Reclamation 2
- United States. Congress. House 2
- Wilson, John M. (John Moulder), 1837-1919 2
- Doerksen, Harvey R. 1
- E.C. Kropp Co. 1