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Creator
- unknown 132
- Oregon. State Highway Division 72
- Oregon State Highway Commission 54
- United States. Bureau of Soils 54
- unknown (photographer) 38
- Skelley, E. A. 35
- Andrews, Clarence Leroy 14
- Hartshorn, Florence M., 1869-1943 12
- Oregon. Department of Fish and Wildlife. Research and Development Section 12
- Oregon. Department of Transportation 10
- Furlong, Charles Wellington, 1874-1967 8
- Geological Survey (U.S.) 8
- Bowman, Walter S. 7
- Moorhouse, Thomas Leander, 1850-1926 7
- University of Oregon. Department of Geography 7
- Oregon Transportation Commission 6
- Wulzen, Albert Henry 6
- Aitken, Alva 5
- Little, David 4
- Wise and Prindle 4