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 D.  Wang, F. H.  Bormann, and D. F.  Karnosky, ?Comment on "Regional Tree Growth Reductions due to Ambient Ozone: Evidence from Field Experiments."?, Environ. Sci. Technol., vol. 21, p. 607-608, 1987.\par \par  D.  Wang, D. F.  Karnosky, and F. H.  Bormann, ?Effects of ambient ozone on the productivity of Populus tremuloides Michx. grown under field conditions?, Can. J. For. Res., vol. 16, p. 47-55, 1986.\par \par  D. F.  Karnosky and R. A.  Mickler, ?Elms (Ulmus sp.)?, in Y. P. S. Bajaj (ed.). Biotechnology in Agriculture and Forestry, Volume I: Trees, 1986, p. 326-340.\par \par  D.  Wang, F. H.  Bormann, and D. F.  Karnosky, ?Regional tree growth reductions due to ambient ozone: evidence from field experiments?, Environ. Sci. Technol., vol. 20, p. 1122-1125, 1986.\par \par  D. F.  Karnosky, A.  Diner, and R. A.  Mickler, ?Micro-propagation of juvenile jackpine and European larch?, Proc. Int. Symp. Recent Adv. For. Biotechnol., Mich. Biotechnol. Inst., East Lansing, 1984.\par \par  D. F.  Karnosky and R. A.  Mickler, ?Propagation and preservation of elms via tissue culture systems?, in M. L. Duryea and G. N. Brown (eds.), 1984, p. 29-36.\par \par  J. M.  Ulrich, R. A.  Mickler, B. J.  Finkle, and D. F.  Karnosky, ?Survival and regeneration of American elm callus cultures after being frozen in liquid nitrogen?, Can. J. For. Res., vol. 14, p. 750-753, 1984.\par \par }