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Unidentified collection (pp.40-41)
Moscow: Muzyka, n.d. Plate 14042
Public Domain - Non-PD EU [tag/del]
||Deux morceaux pour piano
- Impromptu (Allegro, F major)
- Prélude (Andantino, poco rubato, B♭ minor)
||1904? – Moscow: Gutheil
Appears, according to Google Snippet anyway, in 1904 Hofmeister Handbuch.