Page: 
Source: 
p. 3, b. 48-64
p. 1, b. 1-20
p. 2, b. 21-47
p. 3, b. 48-64
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A1 - Working autograph
CJ - Jędrzejewicz Copy
CK - Kolberg Copy
CB - Balakirev Copy
EL - First edition
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Graphic ambiguousness
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A1 - Working autograph
CJ - Jędrzejewicz Copy
CK - Kolberg Copy
CB - Balakirev Copy
EL - First edition
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  b. 56

f in A1, CJCK (→CB)

g in EL

The version of EL is probably Kolberg's revision. However, one cannot rule out a mistake (e.g. of the engraver) due to the resemblance of the accompaniment in b. 55-56 and 51-52. 

Compare the passage in the sources»

category imprint: Differences between sources

issues: Revisions in EL

notation: Pitch

Missing markers on sources: A1, CJ, CK, CB, EL