Madrid, 3 September - Institutional correspondence Carlos Robles Piquer's letter to Javier Tusell, dated 3 September
Madrid, 10 June 1981 - Internal institutional documents A letter from Carlos Robles Piquer to Javier Tusell
Paris, 17 August 1937 - Newspapers The Dream and Lie of Franco. Picasso's Offering to the Spanish People
Madrid, 19 June 1981 - Institutional correspondence A letter from Carlos Robles Piquer to Javier Tusell, dated 19 June 1981
New York, 23 October 1969 - Institutional correspondence Elizabeth Shaw's letter to William S. Lieberman