- Felix Salzer papers /
- Series 2: Heinrich Schenker Nachlass /
- Sub-series 5: Analyses for the Fünf Urlinie-Tafeln, vol. 2 (Mappe 28) /
- Beethoven /
- 28/18 /
- Recto: Sketches, Piano Sonata in c# minor, op. 27, no. 2; "finale/III" written upside down on bottom of page