Cobb, F. W., J. R. Parmeter, D. L. Wood, and R. W. Stark. 1974. Root pathogens as agents predisposing ponderosa pine and white fir to barkbeetles. Pages 8-15 in E. G. Kuhlman (ed), Proceedings of the Fourth International Conference on Fomes annosus, 17-22 Sept. 1973. United States Department of Agriculture, Forest Service, Washington, D. C. 289 p.
Cobb et al. 1974
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