Op. 2, Variations in B♭ major
Op. 10, 12 Etudes
Op. 11, Concerto in E minor
Op. 21, Concerto in F minor
Op. 22, Polonaise in E♭ major
Op. 24, 4 Mazurkas
Op. 25, 12 Etudes
Op. 26, 2 Polonaises
Op. 27, 2 Nocturnes
Op. 28, 24 Preludes
Op. 30, 4 Mazurkas
Op. 35, Sonata in B♭ minor
Op. 50, 3 Mazurkas
Op. 63, 3 Mazurkas
Op. 64, 3 Waltzes
Op. 30 No. 2, Mazurka in B minor
The cautionary 
to a1 is present only in FE (→EE), perhaps added by Chopin in the stage of proofreading FE. In the main text we also add a to a in the L.H.
Compare the passage in the sources »
category imprint: Differences between sources; Editorial revisions
issues: Cautionary accidentals, Authentic corrections of FE
notation: Pitch
