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2. Bruce, D., DeMars, D.J. 1974. Volume equations for second-growth Douglas-fir. USDA Forest Service, Pacific Northwest Forest and Range Experiment Station, Portland, OR. Research Note PNW-239.
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4. Height–diameter and height–diameter–age equations for second-growth Douglas-fir;Curtis;Forest Science,1967
5. LOGS: a pioneering example of silvicultural research in coast Douglas-fir;Curtis;Journal of Forestry,1997