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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Olsen, O W
    Type: Article
    In: Bulletin of the Museum of Comparative Zoology at Harvard College
    Volume: 77
    Date: 1934
    Page Range: 493--514
    Publication Info: Cambridge, Mass The Museum 1863-
  2. By: Olsen, O W
    Type: Article
    In: The Pan-Pacific entomologist
    Volume: 5
    Date: 1929
    Page Range: 181--182
    Publication Info: San Francisco, Pacific Coast Entomological Society,