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Source:
p. 6, b. 53-63
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The cautionary 
before a
2 present in the sources does not seem to be necessary here. Similarly in the penultimate third in bar 58 and in the eleventh one in bar 59. In the entire progression, all a notes (in different octaves) are provided with sharps, which is really justified only in some of the places.
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category imprint: Source & stylistic information
issues: Cautionary accidentals, Last key signature sign
notation: Pitch
Missing markers on sources:
GE1b, FED, FEJ, FES, FE1, FE2, GE1, GE1a, GE2, GE3, FC, EE1, EE2, EE3