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  1. Co-op 19, 20, 21, and 22 : four scab-resistant apple selections released for advanced testing / [prepared by D.F. Dayton ... et al.]
    By: Dayton, D. F. - New Jersey Agricultural Experiment Station. - Purdue University.
    Publication info: Urbana, Ill. :Agricultural Experiment Station, College of Agriculture, University of Illinois at Urbana-Champaign,1977.
    Contributed by: University of Illinois Urbana Champaign
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