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- Pacific Northwest Research Station (Portland, Or.)21
- Curtis, Robert O.11
- Pacific Northwest Forest and Range Experiment Station (Portland, Or.)10
- United States. Forest Service8
- Marshall, David D.7
- Miller, Richard E.7
- Cochran, P. H.6
- Wickman, Boyd E.5
- Harrington, Constance A.4
- DeBell, Dean S.3
- Fight, Roger D.3
- Filip, Gregory M.3
- Gessel, Stanley P.3
- Hoyer, Gerald E.3
- Lopushinsky, W.3
- Willits, Susan3
- Aho, Paul E.2
- Anderson, Harry W.2
- Bilderback, David E.2
- Brodie, Leslie C.2