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
1992-1993 - Internal museum documents Exhibition folder. Picasso: The Love and the Anguish. The Road to Guernica
September to October 1981 - Institutional correspondence Ten letters, telegrams, and some poems sent to congratulate the arrival of Picasso's Guernica at the Museo del Prado
1988-1992 - Internal museum documents Arranging the Collection: The transfer of Pablo Picasso's Guernica to the Centro de Arte Reina Sofía
<em>The New York Times</em>, New York, November 11, 1990, 1, 39 - Article “When Picasso Spooked the FBI”