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  1. A study, by the crop survey method, of factors influencing the yield of potatoes ...
    By: Hardenburg, E. V.
    Publication info: Ithaca,1922
    Contributed by: Library of Congress
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  2. A study, by the crop survey method of factors influencing the yield of potatoes / Earle V. Hardenburg.
    By: Hardenburg, E. V.
    Publication info: Ithaca, N.Y. :Cornell University,1922.
    Contributed by: University of California Libraries (archive.org)
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