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found: nuc88-5706: Cortot, A. Cours d'interprétation, c1979 (hdg. on WU rept.: Thieffry, Jeanne; usage in cataloger's note: Jeanne Thieffry)
found: Cortot, A. Alfred Cortot's studies in musical interpretation, 1989: CIP t.p. (Jeanne Thieffry)