- Upper Willamette Resource Conservation And Development Project30
- Oregon State University. Agricultural Experiment Station19
- Oregon State University. Extension Service18
- Oregon State University Extension Service. Resource Conservation And Development Project Office11
- Ahrens, Glenn R.10
- Bennett, Max, 1963 10
- United States. Soil Conservation Service10
- Withrow Robinson, Bradford A.10
- Boersma, L.5
- Upper Willamette Resource Conservation And Development Area5
- Jackson, T. L. (Thomas Lloyd), 1922 4
- Oregon State College. Agricultural Experiment Station4
- Bates, Earl M.3
- Conklin, Frank S.3
- Institute For Natural Resources3
- Calhoun, Wheeler, 1916 2
- Greene, Charles H. (Charles Henry), 1932 2
- Hemphill, Delbert D.2
- Klock, Glen O.2
- Mack, H. J. (Harry John), 1926 2