Page:
Source:
p. 2, b. 33-64
FE1 - First French edition
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b. 33
The change of the 1st crotchet from B flat to B flat1 in the proofing of FE (→EE) definitely comes from Chopin.
Compare the passage in the sources»
category imprint: Differences between sources; Corrections & alterations
issues: Accompaniment changes, Authentic corrections of FE
notation: Pitch