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  1. By: Nagel, Wilibald A.,
    Publication info: BraunschweigF. Vieweg[1909]
    Holding Institution: University of Toronto - Gerstein Science Information Centre
  2. By: Nagel, Wilibald A.,
    Publication info: Braunschweig,Vieweg,1905-09. [v. 1, 1909]
    Holding Institution: MBLWHOI Library