- Felix Salzer papers /
- Series 2: Heinrich Schenker Nachlass /
- Sub-series 1: Study of thoroughbass, analyses of J.S. Bach, miscellaneous notes (Mappe 6) /
- Notes on J.S. Bach's Generalbassbüchlein (and other notes on Generalbass) /
- 6/133 /
- Copy of Neue Musik-Zeitung, 1920 (Heft 9); Inscription to Schenker by Thomas Frimmel; article on Beethoven Piano Sonata in Ab major by Frimmel, "Beethovens Klaviersonate in As dur"