Chopin added a 12-bar crescendo both in FC (→GE) and FE (→EE). In the main text we reproduce the notation of FC, in which the word cresc. appears in b. 528 slightly earlier (anyway, in the case of such a long dynamic change it does not actually matter). See also b. 540.
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category imprint: Differences between sources; Corrections & alterations
issues: Authentic corrections of FE, Authentic corrections of FC
notation: Verbal indications