Williamson, R. L., and F. E. Price. 1971. Initial thinning effects in 70-150-year-old Douglasfir, western Oregon and Washington. United States Department of Agriculture, Forest Service, Pacific Northwest Research Laboratory, Research Paper PNW-117. 15 p.
Williamson & Price 1971
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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