Letter written by Max Stern when he was doing research for his doctoral dissertation. It was found in his copy of R. Klapheck, Geschichte der Kunstakademie zu Düsseldorf (Düsseldorf: Staatliche Kunstakademie, 1919). Translated from the original German into English, it reads:
29 October 1925
Under the supervision of Privy Councillor Clemen in Bonn, I am working
on my dissertation on Johann Peter von Langer 1756-1824. I would like
to ask you to kindly let me know whether you already have any information
on this artist in your records and whether you would let me have it.
Max Stern kept his word. When his dissertation was completed, he wrote
the article on Langer for the Allgemeines Lexikon der bildenden Künstler
von der Antike bis zur Gegenwart, Leipzig: Seemann, 1928, vol. 22, p.