Herr Donbrowa [Donbroven] worked ‒ possibly as an employee, under the direction of Dr. Eusebius Mandyczewski ‒ in the Archive of the Gesellschaft der Musikfreunde in 1922 and 1923. He presumably worked alondside the assistant archivist, Anton Schittenhelm.

Schenker's diary reports conversations with him on three occasions: May 10, 1922, January 12, 1923, and September 10, 1923.

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