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found: Schönberg, A. [Concerto, piano, op. 42] [Phonodisc] Concerto for piano and orchestra, op. 42, 1953.
found: Musique contemporaine pour piano, p1992: program notes (b. 1922)
found: Int ww in music, 8th (Helffer, Claude; b. 6-18-1922, Paris; pianist)
found: Entretiens avec Claude Helffer, c1995: flap of cover (b. June 28, 1922, Paris)
found: Claude Helffer, la musique sur le bout des doigts, 2005: cover, p. 4 (b. June 18, 1922, Paris; d. Oct. 27, 2004)