- 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) /
- Figured bass and typewritten copies of Schenker's thoroughbass texts /
- 6/350 - 6/352: Four-voice reduction of an unidentified piece with figured bass analysis; question mark on item 6/350 by Felix Salzer