Fayl:Hermann von Helmholtz.jpg

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Hermann von Helmholtz

Practical Physics published 1914

Macmillan and Company

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joriy	08:53, 29-Mart 2012		338 × 440 (42 KB)	Materialscientist	better version from http://www.corbisimages.com/stock-photo/rights-managed/IH015189/hermann-ludwig-ferdinand-von-helmholtz
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