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Please read BHL's Acknowledgment of Harmful Content
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  1. 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
  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: Rev. July 1952.
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1952
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Keen, F. P. (Frederick Paul), - United States. Bureau of Entomology.
    Publication info: [Washington?], U.S. Dept. of Agriculture, [1927]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  5. By: Keen, F. P. (Frederick Paul), - United States. Bureau of Entomology and Plant Quarantine. Division of Forest Insect Investigations.
    Publication info: Portland, Oregon, United States Bureau of Entomology and Plant Quarantine, June 1, 1937
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  6. 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
  7. By: Keen, F. P. (Frederick Paul), - United States. Forest Service.
    Publication info: Washington, D.C, U.S. Dept. of Argiculture, Forest Service, 1955
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library