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 J. S.  Coleman, C. G.  Jones, and W. H.  Smith, ?Interactions between an acute ozone dose, eastern cottonwood, and Marssonina leaf spot: implications for pathogen community dynamics?, Can. J. Bot., vol. 66, p. 863-868, 1988.\par \par  J. S.  Coleman, C. G.  Jones, and W. H.  Smith, ?The effect of ozone on cottonwood-leaf rust interactions: independence of abiotic stress, genotype and leaf ontogeny?, Can. J. Bot., vol. 65, p. 949-953, 1987.\par \par  J. S.  Coleman, C. W.  Murdoch, R. J.  Campana, and W. H.  Smith, ?Investigations on the decay resistance of elm wetwood?, Can. J. Plant Pathol., vol. 7, p. 151-154, 1985.\par \par }