New York, 26 June 1978 - Institutional correspondence A letter from Judith Cousins to William Burback
May - July 1992 - Institutional correspondence Loaned works at the Museo Nacional Centro de Arte Reina Sofía in conjunction with the rearrangement of holdings between the Reina Sofía and Museo Nacional del Prado
Madrid, 8 February 1995 - Internal institutional documents A loan approval form for the exhibition Picasso: The Love and the Anguish. The road to Guernica
New York, 9 September 1939 - Institutional correspondence John Sherman's letter to Marcelene Peterson