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Letter to the Editor

Studies on the Mechanism of Viral Cross Protection. T. A. Shalla, Department of Plant Pathology, University of California, Davis 95616; L. J. Petersen, Department of Plant Pathology, University of California, Davis 95616. Phytopathology 68:1681. . Copyright © 1978 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-68-1681.