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R. F. Scharpf
发表
Proceedings of the symposium on research and management of annosus root disease (Heterobasidion annosum) in western North America; April 18-21, 1989; Monterey, CA.
W. Otrosina, R. F. Scharpf, 1989 .
Spread of european mistletoe (Viscum album) in California, U.S.A.
F. G. Hawksworth, R. F. Scharpf, R. Scharpf, 1986 .