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Letter to the Editor

Some Additional Comments on Sorting Infection-Type Data Sets. D. R. Knott, Professor, Crop Science Department, University of Saskatchewan, Saskatoon, Canada S7N 0W0; R. Johnson, principal scientific officer, Plant Breeding Institute, Cambridge, England CB2 2LQ. Phytopathology 73:514. . Copyright 1983 The American Phytopathological Society. DOI: 10.1094/Phyto-73-514.