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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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  2. Co-op 27, 28, 29, 30, and 31 : five disease-resistant apple selections released for advanced testing / S.S. Korban ... [et al.].
    By: Korban, S. S. - Purdue University.
    Publication info: [Urbana, Ill.] :Agricultural Experiment Station, College of Agriculture, University of Illinois at Urbana-Champaign in cooperation with the Agricultural Experiment Station of Purdue University, West Lafayette, Indian[1990]
    Contributed by: University of Illinois Urbana Champaign
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