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3 documents have been found related to Willem Sandberg and related to the story of Guernica according to Picasso.

Daniel-Henry Kahnweiler's letter to Willem Sandberg, dated 29 September 1955

Paris, 29 September 1955 - Institutional correspondence

Daniel-Henry Kahnweiler's letter to Willem Sandberg, dated 29 September 1955

Courtesy Stadsarchief Amsterdam and Stedelijk Museum Amsterdam

Amsterdam, 23 January 1956 - Institutional correspondence

Willem Sandberg's letter to Alexander Calder, dated 23 January 1956

Willem Sandberg's letter to Pablo Picasso, dated 22 May 1956

Amsterdam, 22 May 1956 - Institutional correspondence

Willem Sandberg's letter to Pablo Picasso, dated 22 May 1956