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  1. Hermann von Helmholtz,
    By: Koenigsberger, Leo, - Welby, Frances A.
    Publication info: Oxford :Clarendon press,1906.
    Holding Institution: University of California Libraries (archive.org)
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  2. Hermann von Helmholtz;
    By: Koenigsberger, Leo, - Welby, Frances Alice,
    Publication info: Oxford,Clarendon Press,1906.
    Holding Institution: University of Toronto - Gerstein Science Information Centre
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  3. Hermann von Helmhotz's Untersuchungen über die Grundlagen der Mathematik,
    By: Koenigsberger, Leo,
    Publication info: LeipzigB.G. Teubner1896
    Holding Institution: University of Toronto - Gerstein Science Information Centre
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