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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Dietz, Harry F. (Harry Frederic), - Zetek, James,
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1920
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Citrus  Citrus black fly  Diseases and pests  
  2. By: United States. Agricultural Research Service. - Berry, N. O.
    Publication info: Washington?, 1954
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Anastrepha ludens  Citrus black fly  Insect pests  United States  
  3. By: United States. Animal and Plant Health Inspection Service. Plant Protection and Quarantine Programs.
    Publication info: [Hyattsville, MD], United States Department of Agricultures, Animal and Plant Health Inspection Service, Plant Protection and Quarantine, July 1982
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Citrus black fly  Insect pests