Hubbes, Martin. Host-parasite in the Hypoxylon canker of aspen Sobretiro de : Breeding Pest-Resistant Trees Proc. NATO and NSF Symp. Pennsylvania State Univ. 1964. Oxford, Pergamon Press, 1966 pp. 229-238 LCCN: 16710 Subjects--Topical Terms: Hypoxylon.Populus tremuloides.