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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ringdahl, O
    Type: Article
    In: Entomologisk tidskrift
    Volume: 43
    Date: 1922
    Page Range: 176--177
    Publication Info: Stockholm Jacob Spångberg 1880-
  2. By: Ringdahl, O
    Type: Article
    In: Entomologisk tidskrift
    Volume: 39
    Date: 1918
    Page Range: 148--194
    Publication Info: Stockholm Jacob Spångberg 1880-
  3. By: Ringdahl, O
    Type: Article
    In: Entomologisk tidskrift
    Volume: 41
    Date: 1920
    Page Range: 24--40
    Publication Info: Stockholm Jacob Spångberg 1880-