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  1. 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
  2. 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