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  1. By: Clark, Ernest Dunbar, - Almy, Lloyd Huber, - Pennington, M. E. (Mary Engle),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1918.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: Clark, Ernest Dunbar, - MacNaughton, Leslie. - Pennington, M. E. (Mary Engle),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1917.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Hepburn, J. S. (Joseph Samuel) - Holder, Ralph Clifton, - McAleer, Henry Aloysius, - Pennington, M. E. (Mary Engle),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1922.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  4. By: Jenkins, M. K. (Minnie Kimball), - Pennington, M. E. (Mary Engle),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1918.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  5. By: Jenkins, M. K. (Minnie Kimball), - Pennington, M. E. (Mary Engle),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1919.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  6. By: Pennington, M. E. (Mary Engle),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1913.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  7. By: Pennington, M. E. (Mary Engle),
    Publication info: Washington,Govt. Print. Off.,1910.
    Holding Institution: University of California Libraries (archive.org)
  8. By: Pennington, M. E. (Mary Engle), - Greenlee, A. D. (Arden Dean) - McAleer, Henry Aloysius,
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1918.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  9. By: Pennington, M. E. (Mary Engle), - Jenkins, M. K. (Minnie Kimball), - Betts, Helen Molony Pennington,
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1918.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  10. By: Pennington, M. E. (Mary Engle), - Jenkins, M. K. (Minnie Kimball), - St. John, E. Quintard, - Hicks, W. B. (William Brooks),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1914.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  11. By: Pennington, M. E. (Mary Engle), - Jenkins, M. K. (Minnie Kimball), - Stocking, W. A. (William Alonzo),
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1916.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  12. By: Pennington, M. E. (Mary Engle), - McAleer, Henry Aloysius, - Greenlee, A. D. (Arden Dean)
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1918.
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  13. By: Pennington, M. E. (Mary Engle), - Pierce, Howard Castner. - Witmer, Evelyn.
    Publication info: Washington,Govt. print. off.,1911.
    Holding Institution: University of California Libraries (archive.org)
  1. By: Pennington, M. E. (Mary Engle), - Smith, Edgar F
    Type: Article
    In: Proceedings of the American Philosophical Society held at Philadelphia for promoting useful knowledge.
    Volume: 33
    Issue: 146
    Date: 1894
    Page Range: 332--336
    Publication info: Philadelphia :American Philosophical Society