From source (in German): Kinderbildnis von Ignác Semmelweis aus den Jahren um 1830. Ölgemälde von Lénárd Landau (1790-1868), einem Pester Maler

(My translation: Child portrait of Ignác Semmelweis from 1830. Oil painting by Lénárd Landau (1790-1868), a painter from Pest.

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