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  1. By: Keffer, Charles A. (Charles Albert),
    Publication info: Brookings, S.D, South Dakota Agricultural College and Experiment Station, 1891
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Keffer, Charles A. (Charles Albert),
    Publication info: Washington, D.C, Dept. of Agriculture, Forestry Division, 1898
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Hatch, K. L. (Kirk Lester), - Haselwood, John Adam, - Keffer, Charles A. (Charles Albert),
    Publication info: Chicago, Row, Peterson & company, 1909
    Holding Institution: Library of Congress
  1. By: Keffer, Charles A. (Charles Albert),
    Type: Correspondence
    In: Asa Gray correspondence
    Date: 1891-03-20
    Publication Info: [1842-1891]
  2. By: Keffer, Charles A. (Charles Albert),
    Type: Article
    In: Botanical gazette
    Volume: 25
    Issue: 2
    Date: 1898
    Page Range: 131--132
    Publication Info: Hanover, Ind, [publisher not identified], 1876-1991