- United States. Forest Service. Pacific Northwest Region7
- Institute For Natural Resources4
- Oregon Natural Heritage Information Center4
- Christy, John A.3
- Hemstrom, Miles A.3
- Oregon Agricultural College. Experiment Station3
- Oregon State University. Extension Service3
- Oregon. Dept. Of Geology And Mineral Industries3
- Topik, Christopher3
- Childs, Leroy, 1888 2
- Crowe, Elizabeth A. (Elizabeth Ann), 1963 2
- Halverson, Nancy M.2
- Hopkins, William E.2
- Johnson, Charles G.2
- Kagan, James S.2
- Kovalchik, Bernard L.2
- Liu, Mingyang2
- Mason, Ralph S.2
- Matney, Casey A.2
- Newton, Vernon C.2