New York, 9 September 1981 - Institutional correspondence An internal letter from Richard E. Oldenburg to staff at the Museum of Modern Art, New York
Madrid, 11 December 1980 - Internal institutional documents Javier Tusell's report on negotiations for the transfer of Guernica
Madrid, 1 June 1981 - Internal institutional documents An internal letter from Javier Tusell to Íñigo Cavero
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
New York, 20 March 1980 - Internal institutional documents An agreement to deliver Guernica to the Spanish government