Paris, 17 November 1959 - Institutional correspondence A letter from the Groupe d'étudiants d'espagnol to Pablo Picasso
Mexico City, 26 September 1968 - Institutional correspondence A letter from Rachmael ben Avram to Nelson Rockefeller
Mexico City, 26 September 1968 - Institutional correspondence Rachmael ben Avram's letter to Carol K. Uht