Amsterdam, 16 November 1953 - Institutional correspondence Willem Sandberg's letter to Pablo Picasso, dated 16 November 1953
Amsterdam, 8 November 1955 - Institutional correspondence Willem Sandberg's letter to Josep Lluís Sert
Mougins, 14 November 1970 - Institutional correspondence Pablo Picasso's letter to the New York's Museum of Modern Art
Paris, 3 October 1948 - Institutional correspondence Pablo Picasso's letter to Alfred H. Barr Jr., dated 3 October 1948
Amsterdam, 5 May 1953 - Institutional correspondence Willem Sandberg's letter to Eugenio Reale, dated 5 May 1953
Amsterdam, 18 August 1953 - Institutional correspondence Willem Sandberg's letter to Eugenio Reale, dated 18 August 1953
Amsterdam, 11 September 1953 - Institutional correspondence Willem Sandberg's letter to Fernanda Wittgens
Pars, 9 February 1955 - Institutional correspondence Pablo Picasso's letter to Alfred H. Barr Jr., dated 9 February 1955
Amsterdam, 11 October 1955 - Institutional correspondence Willem Sandberg's letter to Daniel-Henry Kahnweiler, dated 11 October 1955
Amsterdam, 8 November 1955 - Institutional correspondence Willem Sandberg's letter to Alexander Calder, dated 8 November 1955
Amsterdam, 30 November 1955 - Institutional correspondence Willem Sandberg's letter to Alexander Calder, dated 30 November 1955
Amsterdam, 2 December 1955 - Personal correspondence Willem Sandberg's letter to Maurice Lefebvre-Foinet, dated 2 December 1955
Amsterdam, 3 December 1955 - Institutional correspondence Willem Sandberg's letter to Dora Maar, dated 3 December 1955
Amsterdam, 9 December 1955 - Personal correspondence Willem Sandberg's letter to Maurice Lefebvre-Foinet, dated 9 December 1955
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
Amsterdam, 21 March 1956 - Institutional correspondence Willem Sandberg's letter to Robert Giron, dated 21 March 1956
Amsterdam, 4 April 1956 - Institutional correspondence Willem Sandberg's letter to Robert Giron, dated 4 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