[2 letters by the Bernese Professor Johann Georg Tralles to Georg Christoph Lichtenberg (1786)].
D005858:Germany; D049672:History, 19th Century; D010825:Physics / Q000266:history; D013557:Switzerland; D014956:Writing
Zwei Briefe des Berner Professors Johann Georg Tralles an Georg Christoph Lichtenberg (1786).