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  1. Science of successful threshing. Dingee-MacGregor.
    By: MacGregor, Wallace F., - Dingee, W. W.
    Edition: 6th ed., rev. and enl.
    Publication info: Racine, Wis. :J.I. Case threshing machine co., incorporated,1911.
    Holding Institution: University of California Libraries (archive.org)
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