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Source:
p. 2, b. 20-40
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The cautionary 
before A and a 
before d
2 are in AI, yet they were not included in A. Naturals before both notes of the octave were added in a proofreading of FE (→EE), most probably in the last phase, as they are absent in GE1. In subsequent GE, the signs were added together with cautionary sharps before d1-d2 in the R.H. The last addition is also present in EE4.
The natural before a1 in the R.H. was added by us.
Compare the passage in the sources»
category imprint: Differences between sources; Editorial revisions
issues: EE revisions, GE revisions, Cautionary accidentals, Authentic corrections of FE
notation: Pitch
Missing markers on sources:
A, AI, FE1, FE2, FED, FEJ, FES, GE1a, GE2, GE3, GE4, GE5, EE2, EE3, EE4, GE1