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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Klassen, Waldemar - Creech, James F.
    Publication info: Washington, D.C, Agricultural Research Service, U.S. Dept. of Agriculture, 1971
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Klassen, Waldemar
    Type: Article
    In: Quaestiones entomologicae
    Volume: 4
    Issue: 2
    Date: 1968
    Page Range: 39--56
    Publication Info: Edmonton, Dept. of Entomology, University of Alberta,