The purpose of this thesis was to develop a suitable
multiple regression equation for making estimates of diameter
inside bark at various heights up the bole in
Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)tree.
...
Faqir Mohammad Khan; Bell, John F.; Berg, Alan B.; Oregon State University. Forest Research Laboratory(Corvallis, Or. : School of Forestry, Forest Research Laboratory, Oregon State University, 1977)