3 April 1939 - Minutes Minutes from a meeting of the Executive Committee of the Spanish Intellectual Aid, dated 3 April 1939
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
24 March 1939 - Minutes Minutes from the meeting of the Executive Committee of the Spanish Intellectual Aid Association, dated 24 March 1939
30 March 1939 - Minutes Minutes from a meeting of the Executive Committee of the Spanish Intellectual Aid Association, dated 30 March 1939