This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Gebrueder Gravenhorst. Johann Heinrich Gravenhorst und Christoph Julius Gravenhorst deutsche Chemiker und Unternehmer Braunschweig en Johann Heinrich Gravenhorst and Christoph Julius Gravenhorst chemists and entrepreneurs Brunswick Germany Johann Georg Krnitz Oekonomische Encyklopdie Band Verlag Joachim Pauli Berlin Johann