Madrid, 8 July 1972 - Institutional correspondence A letter from Xavier de Salas to Florentino Pérez Embid
Madrid, May to June 1982 - Conferences and articles Lectures on the 19th century and Guernica given as part of the Missions of Art programme held at the Museo Nacional del Prado from May to June 1982
New York, 9 September 1939 - Institutional correspondence John Sherman's letter to Marcelene Peterson