London, 6 November 1938 - Personal correspondence Roland Penrose's letter to Pablo Picasso, dated 6 November 1938
September, 1939 - Leaflet Programme of activities carried out inside the framework of the exhibition Guernica and 59 Preparatory Studies at the San Francisco Museum of Art
London, 30 September 1938 - Personal correspondence Roland Penrose's letter to Pablo Picasso, dated 30 September 1938
London, 7 October 1938 - Personal correspondence Roland Penrose's postcard to Pablo Picasso and Dora Maar
New York, 21 August 1939 - Institutional correspondence Evelyn Ahrend's letter to Grace L. McCann Morley, dated 21 August 1939