New York, 16 September 1957 - Institutional correspondence A letter from Monroe Wheeler to Katharine Kuh
Madrid, 7 and 19 January 1981 - Institutional correspondence A letter from Enrique Calduch to Javier Tusell
New York, 6 September 1966 - Institutional correspondence Monroe Wheeler's letter to Alfred H. Barr Jr.
New York, 6 December 1957 - Institutional correspondence Monroe Wheeler's letter to Dorothy Miller and Alfred H. Barr Jr.