Madrid, 12 Julio 1971 - Institutional correspondence A letter from Juan Antonio Cánovas del Castillo to Florentino Pérez-Embid
Guernica, December 1971 - Institutional correspondence An appeal to participate in a Pablo Picasso homage in Gernika
Madrid, 8 July 1972 - Institutional correspondence A letter from Xavier de Salas to Florentino Pérez Embid
1973 - Internal institutional documents A report on the ownership of Guernica and a possible transfer to Spain
Madrid, 19 August 1981 - Internal institutional documents A reminder from the general management of Fine Arts, Archives and Libraries regarding the arrival of Guernica to Spain
Madrid, 20 January 1981 - Internal institutional documents A letter from the general management of Fine Art, Archives, and Libraries regarding a conversation held with William Rubin
Madrid, 14 August 1981 - Internal institutional documents A report by SIT for the general management of Fine Art, Archives, and Libraries regarding the transfer of the painting
Internal institutional documents An agreement between the Spanish government and the Museum of Modern Art, New York, drawn up by the Museo del Prado's lawyers
ca. 1981 - Internal institutional documents A report by Javier Tusell, director-general of Fine Arts on his trip to France and his visit to Pablo Picasso's heirs
30 June 1981 - Institutional correspondence Letters from Íñigo Cavero to Pablo Picasso's heirs, dated 30 June 1981
23 January 1981 - Internal institutional documents A report on the state of negotiations to bring Guernica to Spain
1981 - Internal institutional documents A communiqué from Spain's Ministry of Culture about the state of negotiations with the Picasso family to bring Guernica to Spain
Madrid, 25 February and Mexico City, 16 April 1981 - Institutional correspondence Javier Tusell's letter to Wenceslao Roces, and the reply
Madrid, 10 June 1981 - Internal institutional documents A letter from Carlos Robles Piquer to Javier Tusell
Madrid, 13 June 1981 - Institutional correspondence Letters from Íñigo Cavero Pablo Picasso's heirs, dated 13 June 1981
Madrid, 13 June 1981 - Institutional correspondence A letter from Álvaro González de Mesa to Javier Tusell
Paris, 12 May 1981 - Institutional correspondence Rafael Fernández Quintanilla's letter to Carlos Robles Piquer