New York, 7 March 1956 - Institutional correspondence A telegram from Edgar Craig Schenk to Pablo Picasso
Report, 2003 - News programme “El tapiz de Guernica oculto con una cortina azul en la ONU” (Covering of the tapestry Version of Guernica at the UN)
September, 1981 - Management of reproduction rights Memorandum of understanding between the Museum of Modern Art, New York, and Undersigned