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  1. Bibliotheca entomologica, die Litteratur über das ganze Gebiet der Entomologie, bis zum Jahre 1862.
    By: Hagen, Hermann August,
    Publication info: LeipzigW. Engelmann1862-63
    Contributed by: Gerstein - University of Toronto (archive.org)
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  2. Bibliotheca entomologica. Die Litteratur über das ganze Gebiet der Entomologie, bis zum Jahre 1862. Von Hermann August Hagen.
    By: Hagen, Hermann August,
    Publication info: Leipzig :W. Engelmann,1862-63.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  3. Correspondence : Hagen (Hermann) and Engelmann (George), 1879.
    By: Hagen, Hermann August,
    Contributed by: Missouri Botanical Garden, Peter H. Raven Library
    BHL Collections: Engelmann Papers, Missouri Botanical Garden
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  4. Monograph of the North American Astacidae / by Dr. Hermann A. Hagen
    By: Hagen, Hermann August,
    Publication info: Cambridge :[University Press: Welch, Bigelow & co.] :1870.
    Contributed by: Harvard University, MCZ, Ernst Mayr Library
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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  5. Monograph of the North American Astacidæ.
    By: Hagen, Hermann August,
    Publication info: Cambridge[University Press: Welch, Bigelow, & Co.]1870.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  6. Monographie de gomphines,
    By: Sélys-Longchamps, Michel-Edmond, - Hagen, Hermann August,
    Publication info: Bruxelles et Leipzig,C. Muquardt,1858.
    Contributed by: California Academy of Sciences
    BHL Collections: California Academy of Sciences
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  7. Monographie des caloptérygines,
    By: Sélys-Longchamps, Michel-Edmond, - Hagen, Hermann August,
    Publication info: Bruxelles et Leipzig,C. Muquardt,1854.
    Contributed by: California Academy of Sciences
    BHL Collections: California Academy of Sciences
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  8. On some insect deformities / by Hermann A. Hagen.
    By: Hagen, Hermann August,
    Publication info: Cambridge [Mass.] :University Press,1876.
    Contributed by: Harvard University, MCZ, Ernst Mayr Library
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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  9. Synonymia libellularum europaearum
    By: Hagen, Hermann August,
    Publication info: Regimontii Prussorum :impressit E.J. Dalkowski,[1840]
    Contributed by: University of Illinois Urbana Champaign
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  10. Synopsis of the neuroptera of North America with a list of the South American species /
    By: Hagen, Hermann August,
    Publication info: Washington :Smithsonian Institution,1861.
    Contributed by: Canadiana.org (archive.org)
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  11. Synopsis of the neuroptera of North America. With a list of the South American species. Prepared for the Smithsonian institution by Hermann Hagen.
    By: Hagen, Hermann August, - Uhler, Philip R.
    Publication info: Washington,Smithsonian institution,1861.
    Contributed by: University of California Libraries (archive.org)
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  12. Synopsis of the neuroptera of North America. With a list of the South American species. Prepared for the Smithsonian institution by Hermann Hagen.
    By: Hagen, Hermann August, - Uhler, Philip R.
    Publication info: Washington,Smithsonian institution,1861.
    Contributed by: MBLWHOI Library
    BHL Collections: MBLWHOI Library, Woods Hole
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