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b. 74

composition: Op. 10 No 8, Etude in F major

..

At the beginning of the bar A have  before e1. The unjustified in this context sign was removed in the last proofreading of FE (→EE), not included in GE.
Also the  before the 3rd semiquaver in bar 75 is not justified with the previous flow of the music, yet we leave it due to e in the L.H. appearing in the middle of the bar. 

category imprint: Differences between sources

issues: Cautionary accidentals , Authentic corrections of FE , Last key signature sign

b. 76

composition: Op. 10 No 8, Etude in F major

No accidental (e1) in A (→FEGE1,EE3)

Flat in GE2 (→GE3GE4) & EE4

Natural suggested by the editors

..

The flat added in GE2 (→GE3GE4) is certainly non-authentic. Moreover, there is no reason to suppose Chopin's oversight, as e1 is harmonically more justified than e1 due to the dominant harmony of the next bar. Chopin would frequently use this type of harmonic advances in figurations. In order to avoid doubts in the main text, we add a cautionary . The revision of subsequent GE,s was repeated in EE4.

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 77

composition: Op. 10 No 8, Etude in F major

..

In A there are no accidentals before the upper minim in the L.H. at the beginning of the bar and before the penultimate semiquaver in the R.H. First of these undeniable oversights was corrected already in FE (→GE,EE), the second – only in GE.

In A the flat before the 5th semiquaver (e4) is arranged clearly too low, at the level of b3.

category imprint: Interpretations within context; Differences between sources

issues: GE revisions , Omission of current key accidentals , Authentic corrections of FE , Accidental below/above the note , Last key signature sign

b. 79

composition: Op. 10 No 8, Etude in F major

..

The bottom note of the 1st chord in FE is e. This clearly erroneous note was accurately corrected to in GE and EE. A correction in pencil was also written in FES.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in FE , GE revisions

b. 79

composition: Op. 10 No 8, Etude in F major

..

The flat returning b3 at the end of the 1st half of the bar, omitted in A probably by accident, was added in a proofreading of FE (→GE,EE).

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , Errors of A , Authentic corrections of FE