14 June 1973 - Personal correspondence Roland Penrose's letter to Alfred H. Barr and Margaret Scolari Barr
1973 - Internal institutional documents A report on the ownership of Guernica and a possible transfer to Spain
Madrid, 8 February 1982 - Institutional correspondence A letter from Álvaro Martínez Novillo to Pedro J. Ramírez
1982 - Conferences and articles New Guernica: offered to the people of the United States of America through their embassy in Spain