States. Forest Service. California Region, United, United States. Forest Service. Pacific Northwest Region, and Or.) Pacific Northwest Forest and Range Experiment Station (Portland. 1969. Douglas-Fir Supply Study: Alternative Programs for Increasing Timber Supplies From National Forest Lands [by] Regions Five and Six, [and] Pacific Northwest Forest and Range Experiment Station. : [Portland, Or.?] Forest Service, U.S. Dept. of Agriculture.