David R. Harris
L.P.A. Oyen
Don Irving
Melville Thurston Cook
John Mickel
A. J. Richards
Brookhaven National Laboratory.
Rudolph Frederick Peterson
Heinz Jenuwein
Netherlands Study Circle of Plant Breeding
Theophrastus
Research Seminar in Archaeology and Related Subjects London University 1968.
Börje Åberg
Paul F Lurquin
Symposium on the Nature, Induction and Utilization of Mutations in Plants Pullman, Wash. 1969.
Robert Ali Brac de la Perrière
Susanne Heim
Samuel Totten