New York, 25 May 1939 - Institutional correspondence Sidney Janis's letter to the Motion Pictures Artists' Committee
New York, 4 August 1939 - Institutional correspondence Sidney Janis's telegram to the FIne Arts Gallery of San Diego
Madrid, 22 April 1976 - Internal institutional documents A report by Joaquín de la Puente on the ownership of Guernica and the negotiation possibilities with the Museum of Modern Art, New York
Madrid, 10 September 1981 - Internal museum documents Certificate for the reception of Guernica, and its stretcher and related works
New York, 15 May 1939 - Institutional correspondence A letter from Sidney Janis to Charles Goodspeed, dated 15 May 1939
New York, 15 May 1939 - Institutional correspondence Sidney Janis's letter to Charles Goodspeed, dated 15 May 1939
Washington, D. C., 1 June 1939 - Institutional correspondence Sidney Janis's letter to Duncan Phillips
1939 - Institutional correspondence Acceptance letters from Alfred H. Barr Jr., Aleksina Matisse, Georgia O'Keefe and Sidney Janis to Caspar Whitney