Category:Hans Ferdinand Helmolt
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|Date of birth||8 July 1865|
|Date of death||19 March 1929|
|Country of citizenship|
This category has the following 2 subcategories, out of 2 total.
- ► The World's History (1901-1907) (1 C, 144 F)
Media in category "Hans Ferdinand Helmolt"
This category contains only the following file.