Amsterdam, 1956 - Internal museum documents A checklist for the Guernica studies, insurance costs and notes.
New York, 15 May 1956 - Press release and communication A press release announcing the dates of the exhibition Picasso: 75th Anniversary
New York, 7 March 1956 - Institutional correspondence William S. Lieberman's letter to Porter McCrary
New York, 20 September 1956 - Institutional correspondence William S. Lieberman's letter to Alfred H. Barr Jr.
New York, 5 July 1956 - Institutional correspondence William S. Lieberman's letter to Richard Griffith