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  1. By: Keen, F. P. (Frederick Paul),
    Edition: Rev. July 1952.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1952.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Keen, F. P. (Frederick Paul),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1938.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Keen, F. P. (Frederick Paul),
    Edition: Slightly rev. Apr. 1939.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,[1939]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Keen, F. P. (Frederick Paul),
    Edition: Rev. May 1966
    Publication info: [Washington, D.C.?] :U.S. Dept. of Agriculture, Forest Service,[1966]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library