Amsterdam, 11 January 1956 - Transport documents Willem Sandberg's letter to Holland-Amerika Lijn, dated 11 January 1956
Amsterdam, 11 January 1956 - Institutional correspondence Willem Sandberg's letter to Robert Giron, dated 11 January 1956
Roxbury, 12 January 1956 - Institutional correspondence Alexander Calder's letter to Willem Sandberg, dated 12 January 1956
Rotterdam, 13 January 1956 - Transport documents A letter from Holland-Amerika Lijnto to Willem Sandberg, dated 13 January 1956
Amsterdam, 18 January 1956 - Transport documents Hans Ludwig Cohn Jaffé's letter to Holland-Amerika Lijn
Amsterdam, 23 January 1956 - Institutional correspondence Willem Sandberg's letter to Alexander Calder, dated 23 January 1956
Amsterdam, 25 January 1956 - Institutional correspondence M. Winter's letter to Robert Giron, dated 25 January 1956
Amsterdam, 21 February 1956 - Transport documents Willem Sandberg's letter to Holland-Amerika Lijn, dated 21 February 1956
Amsterdam, 24 February 1956 - Institutional correspondence Willem Sandberg's letter to Bernard Karpel, dated 24 February 1956
Amsterdam, 25 February 1956 - Transport documents Willem Sandberg's letter to Holland-Amerika Lijn, dated 25 February 1956
Amsterdam, 27 February 1956 - Institutional correspondence Willem Sandberg's letter to Amsterdam City Council, dated 27 February 1956
New York, 12 March 1956 - Institutional correspondence Bernard Karpel's letter to Willem Sandberg, dated 12 March 1956
Amsterdam, 19 March 1956 - Institutional correspondence Willem Sandberg's letter to René d'Harnoncourt
Amsterdam, 19 March 1956 - Institutional correspondence Willem Sandberg's letter to the Valentin Gallery
Brussels, 4 April 1956 - Institutional correspondence Robert Giron's letter to Willem Sandberg, dated 4 April 1956
Rotterdam, 4 April 1956 - Transport documents A letter from Holland-Amerika Lijn to Willem Sandberg, dated 4 April 1956
Amsterdam, 4 May 1956 - Institutional correspondence Willem Sandberg's letter to Robert Giron, dated 4 May 1956
Paris, 22 May 1956 - Institutional correspondence Daniel-Henry Kahnweiler's letter to Willem Sandberg, dated 22 May 1956
Amsterdam, 22 May 1956 - Institutional correspondence Willem Sandberg's letter to Pablo Picasso, dated 22 May 1956
Amsterdam, 23 May 1956 - Institutional correspondence Willem Sandberg's letter to Bo Wennberg, dated 23 May 1956
Amsterdam, 23 May 1956 - Institutional correspondence Willem Sandberg's letter to Daniel-Henry Kahnweiler, dated 23 May 1956
Stockholm, 7 June 1956 - Institutional correspondence Bo Wennberg's letter to Willem Sandberg, dated 7 June 1956
Amsterdam, 19 July 1956 - Internal museum documents Willem Sandberg's letter to Amsterdam City Council, dated 19 July 1956
Amsterdam, 17 October 1956 - Institutional correspondence A letter from Hans Ludwig Cohn Jaffé's to the editors of the newspaper De Tijd
Stockholm, 11 September 1956 - Institutional correspondence Bo Wennberg's letter to the Stedelijk Museum
Stockholm, 23 October 1956 - Institutional correspondence A letter from Bo Wennberg and K. G. Hulten to Pablo Picasso
New York, 27 November 1956 - Institutional correspondence Bernard Karpel's letter to Willem Sandberg, dated 27 November 1956
Amsterdam, 6 December 1956 - Institutional correspondence Willem Sandberg's letter to Bernard Karpel, dated 6 December 1956
Stockholm, 6 May 1956 - Institutional correspondence Bo Wennberg's letter to Willem Sandberg, dated 6 May 1956
Brussels, 7 May 1956 - Institutional correspondence Robert Giron's letter to Willem Sandberg, dated 7 May 1956
19 July 1956 - Personal correspondence Daniel-Henry Kahnweiler's letter to Pablo Picasso, dated 19 July 1956
Amsterdam, 15 September 1956 - Institutional correspondence Willem Sandberg's letter to Bo Wennberg, dated 15 September 1956
Stockholm, 20 September 1956 - Institutional correspondence Bo Wennberg's letter to Willem Sandberg, dated 20 September 1956
Amsterdam, 24 September 1956 - Institutional correspondence Willem Sandberg's letter to Bo Wennberg, dated 24 September 1956
Stockholm, 1 October 1956 - Institutional correspondence Bo Wennberg's letter to Willem Sandberg, dated 1 October 1956
Amsterdam, 9 October 1956 - Institutional correspondence Willem Sandberg's letter to Bo Wennberg, dated 9 October 1956
Stockholm, 10 October 1956 - Institutional correspondence Bo Wennberg's letter to Willem Sandberg, dated 10 October 1956
Amsterdam, 15 October 1956 - Institutional correspondence Willem Sandberg's letter to Bo Wennberg, dated 15 October 1956
