Madrid, 10 September 1981 - Internal museum documents Certificate for the reception of Guernica, and its stretcher and related works
14 June 1997 - Newspapers The PNV (Basque Nationalist Party) secures a commitment from the PP (People's Party) for the temporary transfer of "Gernika" to Bilbao
Cambridge, Massachusetts. 29 January 1940 - Institutional correspondence A letter from Paul Sachs to Alfred H. Barr Jr.