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Start Over Subjects Helmholtz, Hermann von, 1821-1894. ✖Remove constraint Subjects: Helmholtz, Hermann von, 1821-1894. Authors Thom, Robert A. (Robert Alan), 1915-1979, artist ✖Remove constraint Authors: Thom, Robert A. (Robert Alan), 1915-1979, artist Publication Year 1961 ✖Remove constraint Publication Year: 1961

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