1. Dew and the growth of the uredospore germ tube of Puccinia graminis on the wheat leaf
2. B. C. Clifford(1968 ). Relations of disease resistance mechanisms to pathogen dynamics in oat crown rust epidemiology . Ph.D. thesis , Purdue University.
3. B. C. Clifford(1972 ). The histology of race non specific resistance toPuccinia hordeiOtth. in barley . Proc 5th European and Medn. Cereal Rusts Conference, Prague 1972, 1 , 1 .