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Hermann von Helmholtz
Practical Physics published 1914
Macmillan and Company

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current08:53, 29 March 2012Thumbnail for version as of 08:53, 29 March 2012338 × 440 (42 KB)Materialscientistbetter version from http://www.corbisimages.com/stock-photo/rights-managed/IH015189/hermann-ludwig-ferdinand-von-helmholtz
20:00, 11 March 2005Thumbnail for version as of 20:00, 11 March 2005255 × 332 (20 KB)-xrydz-# {{PD-US}}

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