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Source:
p. 1, b. 1-32
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The cautionary accidentals before the first notes on both staves, a 
to E and a 
to d
2, are present in all sources except GE1. Formally speaking, they are not necessary; however, in this context their absence must be considered a mistake. Both were added in GE2 (→GE3), along with a third one, a to e2.
Compare the passage in the sources»
category imprint: Differences between sources
issues: GE revisions
notation: Pitch
Missing markers on sources:
AI, EEW, EEC, FE1, FE2, FES, GE1, GE2, GE3