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  1. Hermann Ludwig Ferdinand von Helmholtz, by John Gray M'Kendrick.
    By: McKendrick, John Gray,
    Publication info: New York :Longmans, Green & Co.,1899.
    Contributed by: University of California Libraries (archive.org)
    Subjects: 1821-1894  Helmholtz, Hermann von,  
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  2. Hermann von Helmholtz, by Leo Koenigsberger. Tr. by Frances A. Welby with a preface by Lord Kelvin.
    By: Koenigsberger, Leo, - Koenigsberger, Leo, - Welby, Frances A.
    Publication info: Oxford :Clarendon press,1906.
    Contributed by: University of California Libraries (archive.org)
    Subjects: 1821-1894  Helmholtz, Hermann von,  
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  3. Hermann von Helmholtz; translated by Frances A. Welby; with a preface by Lord Kelvin.
    By: Koenigsberger, Leo, - Koenigsberger, Leo, - Welby, Frances Alice,
    Publication info: Oxford,Clarendon Press,1906.
    Contributed by: Gerstein - University of Toronto (archive.org)
    Subjects: 1821-1894  Helmholtz, Hermann von,  
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  4. Hermann von Helmhotz's Untersuchungen über die Grundlagen der Mathematik,
    By: Koenigsberger, Leo, - Koenigsberger, Leo,
    Publication info: LeipzigB.G. Teubner1896
    Contributed by: Gerstein - University of Toronto (archive.org)
    Subjects: 1821-1894  Helmholtz, Hermann von,  
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