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  1. A study of the framework of the apple tree and its relation to longevity / by W.A. Ruth and Victor W. Kelley.
    By: Ruth, W. A. (Warren Albert), - Kelley, Victor W. (Victor Wendell),
    Publication info: [Urbana, Ill.] :University of Illinois Agricultural Experiment Station,[1932].
    Contributed by: University Library, University of Illinois Urbana Champaign
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