16 September 1960 - Internal museum documents A letter from Betsy Jones to Alfred H. Barr Jr., dated 16 September 1960
10 September 1981 - Internal museum documents Registration sheet for the Picasso works deposited at the Casón, including Guernica
1988-1992 - Internal museum documents Arranging the Collection: The transfer of Pablo Picasso's Guernica to the Centro de Arte Reina Sofía