Madrid, 2 December 1975 and Berkeley, California, 8 January 1976 - Institutional correspondence A letter from José Mario Armero to Herschel B. Chip, with reply
New York, 8 April 1981 - Press release and communication A press release from New York's Museum of Modern Art concerning a Spanish delegation's request to send Guernica to Spain
ca. 1952–1956 - Internal museum documents Publicity report for the exhibition Studies for Guernica by Arkansas University, addressed to the Travelling Exhibitions Department at the Museum of Modern Art, New York