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  1. By: Hagen, H A
    Type: Article
    In: Psyche.
    Volume: 2
    Date: 1879
    Page Range: 210--211
    Publication info: Cambridge, Mass. :Cambridge Entomological Club
  2. By: Hagen, H A
    Type: Article
    In: The Canadian entomologist.
    Volume: 13
    Date: 1881
    Page Range: 146--150
    Publication info: Ottawa [etc.]Entomological Society of Canada [etc.]
  3. By: Hagen, H A
    Type: Article
    In: Transactions of the American Entomological Society and proceedings of the Entomological Section of the Academy of Natural Sciences.
    Volume: 12
    Date: 1885
    Page Range: 249--291
    Publication info: Philadelphia :The Society,1878-1889
  4. By: Hagen, H A
    Type: Article
    In: Psyche.
    Volume: 5
    Date: 1890
    Page Range: 333--334
    Publication info: Cambridge, Mass. :Cambridge Entomological Club
  5. By: Hagen, H A
    Type: Article
    In: The Canadian entomologist.
    Volume: 19
    Date: 1887
    Page Range: 209--217
    Publication info: Ottawa [etc.]Entomological Society of Canada [etc.]
  6. By: Hagen, H A
    Type: Article
    In: The Canadian entomologist.
    Volume: 20
    Date: 1888
    Page Range: 34--38
    Publication info: Ottawa [etc.]Entomological Society of Canada [etc.]
  7. By: Hagen, H A
    Type: Article
    In: The Canadian entomologist.
    Volume: 20
    Date: 1888
    Page Range: 185--191
    Publication info: Ottawa [etc.]Entomological Society of Canada [etc.]
  8. By: Hagen, H A
    Type: Article
    In: Verhandlungen des Zoologisch-Botanischen Vereins in Wien.
    Volume: 9
    Date: 1859
    Page Range: 199--212
    Publication info: Wien :In Commission in W. Braumüller's Hof-Buchhandlung,1852-
  9. By: Hagen, H A
    Type: Article
    In: Verhandlungen des Zoologisch-Botanischen Vereins in Wien.
    Volume: 8
    Date: 1858
    Page Range: 471--488
    Publication info: Wien :In Commission in W. Braumüller's Hof-Buchhandlung,1852-
  10. By: Hagen, H A
    Type: Article
    In: Transactions of the American Entomological Society
    Volume: 17
    Date: 1890
    Page Range: 229--236
    Publication info: Philadelphia :The Society at the Academy of Natural Sciences,1890-