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current | 19:14, 20 October 2009 | 1,323 × 2,054 (387 KB) | Neumann-Meding | {{Information |Description={{en|1=Karl Gottfried Hagen as young professor at the University of Koenigsberg, Prussia, todays Kaliningrad}} {{de|1=Karl Gottfried Hagen (1749 - 1829) Universalgelehrter für Chemie, Physik, Medizin, Botanik, Mineralogie, Freu |
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