- The Oster collection [microform] : papers of Heinrich Schenker /
- File 38: Draft Material for Der Freie Satz and Early Articles /
- Part 1A /
- Recto: Musical example from Ludwig van Beethoven, Symphony No. 7, Op. 92, 1st movement, measures 156-157 (an earlier version of figure 74, 3 of Der freie Satz)