Harmonia Mundi (France) HM 730 (LP) Sonates et interludes pour piano préparé.

John Cage: Sonatas and Interludes (1946-48)

Side 1 (Face A):
Sonatas I, II, III, IV
Interlude I
Sonatas V, VI, VII, VIII
Interludes II, III

Side 2 (Face B):
Sonatas IX, X, XI, XII
Interlude IV
Sonatas XIII, XIV, XV, XVI

Maro Ajemian, prepared piano

"Publié par Composers Recordings Inc.". This means that this is the same recording as on LP's Dial 19-20 (1951, original release), CRI SD 199 and Harmonia Mundi HMO 34730.
In 1995 released on CD: CRI 700
Currently available on CD: él records ACMEM88CD

The LP is packaged in a plain cover, without any text.
Recorded (ADD) in 1950 in the Studios of WOR in New York City
LP released in 1980? (not mentioned)

Sources: Original LP, New Albion Discography and Northwestern University Library Catalog