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  1. By: Frey, Richard,
    Type: Article
    In: Meddelanden af Societas pro Fauna et Flora Fennica
    Volume: 39
    Date: 1913
    Page Range: 106--121
    Publication Info: Helsingfors, [Societas pro Fauna et Flora Fennica],
  2. By: Frey, Richard,
    Type: Article
    In: Revue suisse de zoologie
    Volume: 41
    Date: 1934
    Page Range: 299--339
    Publication Info: Genève, Kundig [etc.],
  3. By: Frey, Richard,
    Type: Article
    In: Meddelanden af Societas pro Fauna et Flora Fennica
    Volume: 37
    Date: 1911
    Page Range: 91--92
    Publication Info: Helsingfors, [Societas pro Fauna et Flora Fennica],
  4. By: Frey, Richard,
    Type: Article
    In: Meddelanden af Societas pro Fauna et Flora Fennica
    Volume: 43
    Date: 1917
    Page Range: 84--97
    Publication Info: Helsingfors, [Societas pro Fauna et Flora Fennica],
  5. By: Frey, Richard,
    Type: Article
    In: Meddelanden af Societas pro Fauna et Flora Fennica
    Volume: 44
    Date: 1918
    Page Range: 43--44
    Publication Info: Helsingfors, [Societas pro Fauna et Flora Fennica],
  6. By: Frey, Richard,
    Type: Article
    In: Öfversigt af Finska vetenskaps-societetens förhandlingar
    Volume: 60 A
    Date: 1919
    Page Range: 1--35
    Publication Info: [S.l, s.n.],