New York, 22 April 1960 - Institutional correspondence A letter from Jan-Albert Goris to Nelson Rockefeller, dated 22 April 1960
New York, 25 April 1960 - Institutional correspondence Jan-Albert Goris's letter to Nelson Rockefeller, dated 25 April 1960
New York, 9 September 1939 - Institutional correspondence John Sherman's letter to Marcelene Peterson
New York, 14 November 1939 - Institutional correspondence Nelson Rockefeller's telegram to Pablo Picasso