Madrid, 12 February 1976 - Institutional correspondence A letter from the director-general of Cultural Heritage
Madrid, 16 February 1976 - Institutional correspondence A report from the National Commission of Artistic Heritage on the documents needed to recover Guernica.
16 February 1976 - Institutional correspondence Report for the National Commission of Artistic Heritage
Cambridge (Massachusetts), 23 December 1976 - Institutional correspondence A letter from Josep Lluís Sert to Herschel B. Chipp
