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Letter to the Editor

Durable Resistance: Definition of, Genetic Control, and Attainment in Plant Breeding. Roy Johnson, Plant Breeding Institute, Trumpington, Cambridge CB2 2LQ, England; Phytopathology 71:567. Accepted for publication 21 January 1981. Copyright 1981 The American Phytopathological Society. DOI: 10.1094/Phyto-71-567.