Madrid, 22 April 1976 - Internal institutional documents A report by Joaquín de la Puente on the ownership of Guernica and the negotiation possibilities with the Museum of Modern Art, New York
Sariñena (Huesca), 18 September 1936 - Institutional correspondence A letter from Francisco Ruiz (Jean Aaron) to Pablo Picasso
Madrid, 10 September 1981 - Internal museum documents Certificate for the reception of Guernica, and its stretcher and related works