- Oregon State University. Extension Service198
- Oregon Agricultural College. Extension Service44
- Oregon State University. Cooperative Extension Service33
- Oregon Agricultural College. Extension Division17
- Nelson, A. Gene13
- Pease, James R. (James Robert)12
- Solutions To Environmental & Economic Problems (Organization)9
- Dryden, James, 1863 8
- Oregon State University. Agricultural Experiment Station8
- Weber, Bruce A.8
- Sorte, Bruce7
- Vomocil, James A.7
- Oregon State University. Department Of Geography6
- Calvin, Henrietta W.5
- Groder, Roland H.5
- Maxwell, Darrell C.5
- Obermiller, Frederick W.5
- Oregon Agricultural College. Department Of College Extension5
- Wilder, Robert L.5
- Youmans, Russell C.5