20 February 1980 - Institutional correspondence A letter from Ricardo de la Cierva Hoces to Adolfo Suárez
Madrid, 28 June 1980 - Institutional correspondence Ricardo de la Cierva Hoces' letter to Javier Tusell
ca. 1952–1956 - Internal museum documents Publicity report for the exhibition Studies for Guernica by the Berea College Art Department, Kentucky, addressed to the Travelling Exhibitions Department at the Museum of Modern Art, New York