Ferrell, G. T., and R. C. Hall. 1975. Weather and tree growth associated with white fir mortality by fir engraver and roundheaded fir borer. United States Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station, Research Paper PSW-109. 11 p.
Ferrell & Hall 1975
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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