New York, 6 May 1955 - Institutional correspondence A letter from W.R. Keating & Company International to R. Lerondelle
New York, 23 January 1957 - Transport documents A letter from the vice-president of W. R. Keating & Company to Willem Sandberg
Valladolid, 29 August 2006 - Photograph A woman contemplates one of the illustrated panels from the exhibition Pablo Picasso, Guernica. History of a Painting
New York, 7 October 1953 - Institutional correspondence A letter from Letitia T. Howe to Pablo Picasso