Brussels, 14 May 1956 - Institutional correspondence A letter from the Spanish ambassador in Belgium to Alberto Martín-Artajo Álvarez
Madrid, 1981 - Photograph Placing the reproduction of Guernica for the test installation in the Casón del Buen Retiro
6 September 1992 - Newspapers The Reina Sofía presents its Collection and becomes the century's museum of Spanish art