Cochran, P., and J. Barrett. 1998. Thirtyfive-year growth of thinned and unthinned ponderosa pine in the Methow Valley of northern Washington. United States Department of Agriculture, Forest Service, Pacific Northwest Research Station (Portland, OR), Research Paper PNW-RP 502. 24 pp.
Cochran & Barrett 1998
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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