New York, 6 June 1939 - Institutional correspondence Evelyn Ahrend's letter to Charles Goodspeed, dated 6 June 1939
New York, 21 June 1939 - Institutional correspondence Evelyn Ahrend's letter to Charles Goodspeed, dated 21 June 1939
10 March 1957 - Internal museum documents A provisional list of Pablo Picasso works on loan at the Museum of Modern Art, New York