New York, 6 January 1960 - Management of reproduction rights A letter from the Spanish Refugee Aid, Inc. to Pablo Picasso
23 August 1939 - Internal museum documents Certificate of delivery for Guernica and other materials sent from the Spanish Refugee Relief Campaign to the San Francisco Museum of Art
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