| Description | /1/1. 1 x ts. letter, 20 September 1971, from William S. Rubin of the Museum of Modern Art, New York, to Roland Penrose, 1p.
/1/2. 1 x ts. letter, 28 September 1971, reply from Roland Penrose, to William S. Rubin of the Museum of Modern Art, New York, 1p. |