Cleveland, 25 May 1939 - Institutional correspondence William Mathewson Milliken's letter to Sidney Janis
1940 - Internal museum documents Circulating exhibition contract for Picasso: Forty Years of His Art (second edition), between the Museum of Modern Art, New York, and the Cleveland Museum of Art
ca. 1981 - Newspapers The Guernica Imbroglio. Al international Tug-of-War over Picasso's Protest Painting