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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Treherne, R. C. (Reginald Charles), - British Columbia. Horticultural Branch.
    Edition: 2nd ed.
    Publication info: Victoria, B.C, W.H. Cullin, 1919
    Holding Institution: Canadiana.org
    Subjects: British Columbia  Control  Diseases and pests  Insect pests  Onion thrips  Onions  
  2. By: Kentucky tobacco product company, incorporated, Louisville, Ky.
    Publication info: Louisville, Ky, The Kentucky tobacco product company, incorporated, c1916
    Holding Institution: Library of Congress
    Subjects: Onion thrips  Spraying