Madrid, 8 July 1972 - Institutional correspondence A letter from Xavier de Salas to Florentino Pérez Embid
Valladolid, 29 August 2006 - Photograph A woman contemplates one of the illustrated panels from the exhibition Pablo Picasso, Guernica. History of a Painting
Madrid, 11 December 1979 - Institutional correspondence Marcelino Oreja's letter to Manuel Clavero Arévalo