FEF
compare
In JC, lack of the 
raising b
1 into b1 in bar 72 is probably an error of the copyist, similarly as lack of tie holding this note. The natural in bar 73 is featured in all sources, yet we omit it in the places where the note is sustained (cf. General Editorial Principles, p. 3).
Compare the passage in the sources »
category imprint: Differences between sources
issues: Errors of JC
notation: Pitch