USDA Forest Service resource bulletin PNW
Pacific Northwest Forest and Range Experiment Station
Debra D. Warren
United States Department of Agriculture, Forest Service, Pacific Northwest Research Station 1994 USDA Forest Service resource bulletin PNW RB-202
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United States Department of Agriculture, Forest Service, Pacific Northwest Research Station 1993 USDA Forest Service resource bulletin PNW RB-195
United States Department of Agriculture, Forest Service, Pacific Northwest Research Station 1992 USDA Forest Service resource bulletin PNW RB-192
Harold F. Heady, James Bartolome
Pacific Northwest Forest and Range Experiment Station, Forest Service, U.S. Department of Agriculture 1977 USDA Forest Service resource bulletin PNW 70
