Etudes Op. 10,
10/3,5-12–A-Stichvorlage,
p. [8] No. 12, bs 66–84
The Fryderyk Chopin Institut, Warsaw (Nos. 3, 5, 6, 8–10); Pierpont-Morgan Library, New York (No. 7); Stiftelsen Musikkulturens Främjande, Stockholm (Nos. 11 & 12)