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Ostry, M.; Woeste, K. (July 2004), "Spread of Butternut Canker in North America, Host Range, Evidence of Resistance Within Butternut Populations and Conservation Genetics"(PDF), in Michler, C. H.; Pijut, P. M.; Van Sambeek, J. W.; Coggeshall, M. V.; Seifert, J.; Woeste, K.; Overton, R.; Ponder, F. Jr (eds.), Black walnut in a new century, proceedings of the 6th Walnut Council research symposium, Lafayette, IN. Gen. Tech. Rep. NC-243. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Research Station, pp. 25–28, archived from the original(PDF) on 2013-02-15, retrieved 2007-10-14