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| View Original: | Helmholtz 1876.jpg (698x907) | |||
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| Keywords: Helmholtz 1876.jpg Hermann von Helmholtz in 1876 portrait https //archive org/details/hermannvonhelmh00welbgoog Hermann von Helmholtz by Leo Königsberger published 1906 Reproduction of portrait by Franz von Lenbach Hermann von Helmholtz PD-old | ||||
