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 .