Bonn, 16 February 1956 - Institutional correspondence Antonio Mª Aguirre's letter to Alberto Martín-Artajo Álvarez
Madrid, 21 February 1969 - Institutional correspondence Florentino Pérez-Embid's letter to Joaquín de la Fuente
Communiqué, Boston, October 4, 2012 - Press release Museum of Fine Arts, Boston, Helps Commemorate the 50th Anniversary of the Cuban Missile Crisis with the Loan of a Picasso to the JFK Library and Museum