![](http://www.alamy.com/thumbs/6/BB6BFEB3-1091-434A-A78F-BE9A333456D0/2PK8FAD.jpg)
Portrait of the Physicist Hermann von Helmholtz 1881 by Ludwig Knaus
Size: 2311px × 3303px
Photo credit: © ARTGEN / Alamy / Afripics
License: Licensed
Model Released: No
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