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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Benson, Mary F. - United States. Bureau of Entomology and Plant Quarantine.
    Edition: Rev. Aug. 1950.
    Publication info: [Washington, D.C.], Bureau of Entomology and Plant Quarantine, U.S. Dept. of Agriculture, 1950
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Corn  Diseases and pests  Helicoverpa armigera  
  2. By: Benson, Mary F. - United States. Bureau of Entomology and Plant Quarantine.
    Publication info: [Washington, D.C.], Bureau of Entomology and Plant Quarantine, U.S. Dept. of Agriculture, 1951
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Helicoverpa armigera  Internet resource