Madrid, 10 September 1981 - Photograph The boxes protecting Guernica are taken out of the lorries and taken into the Casón del Buen Retiro
Northampton, Massachusetts, 16 May 1939 - Institutional correspondence Jere Abbott's letter to Sidney Janis
27 March 1940 - Internal museum documents Circulating exhibition contract for Picasso: Forty Years of His Art, between the Museum of Modern Art, New York, and the Institute of Modern Art, Boston