Mainz, 20 July 1955 - Institutional correspondence A letter from J. Mougin to Jacques Guerin, dated 20 July 1955
Mainz, 13 October 1955 - Institutional correspondence J. Mougin's letter to François Mathey, dated 13 October 1955
Mainz, 18 October 1955 - Institutional correspondence J. Mougin's letter to Jacques Guerin, dated 18 October 1955
Mainz, 2 May 1956 - Institutional correspondence J. Mougin's letter to François Mathey, dated 2 May 1956
Madrid, 3 September - Institutional correspondence Carlos Robles Piquer's letter to Javier Tusell, dated 3 September
Madrid, 10 June 1981 - Internal institutional documents A letter from Carlos Robles Piquer to Javier Tusell
Madrid, 19 June 1981 - Institutional correspondence A letter from Carlos Robles Piquer to Javier Tusell, dated 19 June 1981