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  1. By: Hammatt, R. F. (Richard Fox),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1936.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Hammatt, R. F. (Richard Fox),
    Edition: Rev. Dec. 1939.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1939.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library