Providence, Rhode Island, 12 May 1939 - Institutional correspondence Alexander Dorner's letter to Sidney Janis
28 February 1974 - Press release and communication The artist Tony Shafrazi has freed Guernica from its chains of ownership and has returned its revolutionary nature
New York, April 1967 - Petition A request from Angry Arts to support the withdrawal of Guernica from the Museum of Modern Art, New York