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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Wilson, Orville Turner,
    Publication info: Chicago, 1920
    Holding Institution: Library of Congress
    Subjects: Alfalfa  Crown-gall disease  Diseases and pests  
  2. By: Hedgcock, George G. (George Grant),
    Publication info: Washington, G.P.O, 1910
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Apples  Crown-gall disease  Diseases and pests  Hairy-root disease
  3. By: Waite, Merton Benway, - Siegler, E. A. (Eugene Alfred),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1926
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Apples  Crown-gall disease  Diseases and pests  Internet resource