London, 6 November 1938 - Personal correspondence Roland Penrose's letter to Pablo Picasso, dated 6 November 1938
New York, 6 January 1960 - Management of reproduction rights A letter from the Spanish Refugee Aid, Inc. to Pablo Picasso
London, 30 September 1938 - Personal correspondence Roland Penrose's letter to Pablo Picasso, dated 30 September 1938
London, 1938 - Exhibition catalogue Catalogue of the exhibition Picasso's Guernica at the New Burlington Galleries
Chicago, 11 October 1939 - Institutional correspondence Charles Goodspeed's telegram to Pablo Picasso
Philadelphia, 15 April 1945 - Institutional correspondence Madelin Blitzstein's letter to Pablo Picasso