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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Forbes, Stephen Alfred,
    Publication info: Urbana, [Ill.], University of Illinois Agricultural Experiment Station, 1907
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Diseases and pests  Illinois  Scale-insects  Shrubs  Trees  
  2. By: Lochhead, W. - Ontario. Dept. of Agriculture.
    Publication info: [Toronto?, s.n.], 1900
    Holding Institution: Canadiana.org
    Subjects: Diseases and pests  Fruit  Scale-insects