Per Grove Online, reprinted in 1980 from Sobranie sochineniĭ / S. Prokofʹev. Moskva : Gos. muzykalʹnoe izd-vo, 1955-1967.
"Based on the score written out by Pavel Lamm from the composer's rough MS, preserved at the Glinka Museum of Musical Culture, and from the MS orchestral parts in the ... Moscow Philharmonic Music Library"--Editors' note.