Paris, 3 October 1948 - Institutional correspondence Pablo Picasso's letter to Alfred H. Barr Jr., dated 3 October 1948
Paris, 26 November 1948 - Institutional correspondence A letter from Pablo Picasso to Alfred H. Barr Jr., dated 26 November 1948
Paris, 23 August 1951 - Personal correspondence Pablo Picasso's letter to Roland Penrose, dated 23 August 1951