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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Molengraaff, G. A. F. (Gustaaf Adolf Frederik),
    Publication info: Leyden, E.J. Brill, 1902
    Holding Institution: Delaware Museum of Natural History Library
  2. By: Molengraaff, G. A. F. (Gustaaf Adolf Frederik),
    Publication info: Leiden, E.J. Brill, 1915-1922
    Holding Institution: University of Toronto - Robarts Library