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
Prague, 14 November 1947 - Institutional correspondence A letter from J. Groham and T. Madden to Pablo Picasso