Roxbury, 22 November 1955 - Institutional correspondence Alexander Calder's letter to Willem Sandberg, dated 22 November 1955
São Paulo, 1953 - Institutional correspondence A letter from Paulo E. de Berrêdo Carneiro to Francisco Matarazzo Sobrinho
São Paulo, 11 March 1953 - Institutional correspondence A letter from Paulo E. de Berrêdo Carneiro, dated 11 March 1953
São Paulo, 11 March 1953 - Personal correspondence A letter from Paulo E. de Berrêdo Carneiro, dated 11 March 1953
São Paulo, 19 June 1953 - Institutional correspondence Paulo E. de Berrêdo Carneiro's letter to Arturo Profili
Roxbury, 12 January 1956 - Institutional correspondence Alexander Calder's letter to Willem Sandberg, dated 12 January 1956