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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Schmidt, Heinrich, - Haeckel, Ernst,
    Publication info: Leipzig, Verlag Unesma G.m.b.H, 1914
    Holding Institution: MBLWHOI Library
  2. By: Schmidt, Heinrich,
    Publication info: Leipzig, A. Kröner, 1912
    Holding Institution: NCSU Libraries (archive.org)
  3. By: Ziegler, H. E. (Heinrich Ernst), - Bresslau, E. (Ernst), - Eichler, J. - Fraas, E. (Eberhard), - Lampert, Kurt, - Schmidt, Heinrich,
    Publication info: Jens, G. Fischer, 1909
    Holding Institution: MBLWHOI Library