Roxbury, 22 November 1955 - Institutional correspondence Alexander Calder's letter to Willem Sandberg, dated 22 November 1955
Roxbury, 12 January 1956 - Institutional correspondence Alexander Calder's letter to Willem Sandberg, dated 12 January 1956
New York, 8 May 1956 - Institutional correspondence Carol K. Uht's letter to Petro (Nelly) Van Doesburg
New York, 9 April 1963 - Institutional correspondence Carol K. Uht's letter to Nelson Rockefeller, dated 9 April 1963
New York, 27 August 1968 - Internal institutional documents Carol K. Uht's letter to Nelson Rockefeller, dated 27 August 1968
New York, 24 March 1969 - Institutional correspondence Carol K. Uht's letter to Nelson Rockefeller, dated 24 March 1969
New York, 30 April 1969 - Institutional correspondence Carol K. Uht's letter to Richard Gordon Hatche