Zurich, 12 December 1955 - Institutional correspondence A letter from Klaus Herdeg to Willem Sandberg
Amsterdam, 16 December 1955 - Institutional correspondence Willem Sandberg's letter to Dora Maar, dated 16 December 1955
Amsterdam, 27 December 1955 - Institutional correspondence Willem Sandberg's letter to l'Association Française d'Action Artistique
Paris, September 7, 1955 - Personal correspondence Daniel-Henry Kahnweiler's letter to Pablo Picasso, dated September 7, 1955
Paris, 25 April 1956 - Personal correspondence Daniel-Henry Kahnweiler's letter to Pablo Picasso, dated 25 April 1956
Amsterdam, 25 January 1956 - Transport documents M. Winter's letter to Robert Giron, dated 25 January 1956
Brussels, 17 February 1956 - Institutional correspondence Robert Giron's letter to Willem Sandberg, dated 17 February 1956
Brussels, 25 February 1956 - Institutional correspondence Robert Giron's letter to Willem Sandberg, dated 25 February 1956
Amsterdam, 21 March 1956 - Institutional correspondence Willem Sandberg's letter to Robert Giron, dated 21 March 1956
Brussels, 28 March 1956 - Insurance documents Robert Giron's letter to Willem Sandberg, dated 28 March 1956
Amsterdam, 4 April 1956 - Institutional correspondence Willem Sandberg's letter to Robert Giron, dated 4 April 1956
Brussels, 10 April 1956 - Institutional correspondence Robert Giron's letter to Willem Sandberg, dated 10 April 1956
Amsterdam, 11 April 1956 - Institutional correspondence Willem Sandberg's letter to Robert Giron, dated 11 April 1956
Amsterdam and Brussels, 1956 - Exhibition catalogue Guernica: avec 60 études et variantesGuernica: met 60 studies et varianten
Amsterdam, 19 June 1956 - Internal museum documents History, chronology of Picasso and a report on Rodin's exhibition project
Amsterdam, 1956 - Internal museum documents A checklist for the Guernica studies, insurance costs and notes.
