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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Harbach, Ralph E - Parkin, Emma - Chen, Bin - Butlin, Roger,
    Type: Article
    In: Proceedings of the Entomological Society of Washington
    Volume: 108
    Date: 2006
    Page Range: 198--209
    Publication Info: Washington, etc, Entomological Society of Washington,
  2. By: Monk, K A - Butlin, Roger,
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: 133
    Date: 1990
    Page Range: 31--38
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,
  3. By: Butlin, Roger, - Blackith, R. E. (Robert Edmund), - Blackith, Ruth M.
    Type: Article
    In: Tijdschrift voor entomologie
    Volume: 132
    Date: 1989
    Page Range: 109--113
    Publication Info: [Amsterdam], Nederlandse Entomologische Vereniging,