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  1. By: Cromwell, Richard O. (Richard Oliver),
    Publication info: Lincoln? 1918
    Holding Institution: Library of Congress
  2. By: Cromwell, Richard O. (Richard Oliver),
    Publication info: Lincoln, Neb, University of Nebraska, 1919
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Wolf, Frederick A. (Frederick Adolph), - Cromwell, Richard O. (Richard Oliver),
    Type: Article
    In: Technical bulletin
    Volume: 16
    Series: Technical bulletin (North Carolina Agricultural Experiment Station)
    Date: 1919
    Page Range: 1--22
    Publication Info: Raleigh, The Station,