Chicago, 21 February 1955 - Management of reproduction rights Marilyn Vaughan's letter to Pablo Picasso
New York, 6 January 1960 - Management of reproduction rights A letter from the Spanish Refugee Aid, Inc. to Pablo Picasso
15 September 1960 - Internal museum documents A cheque for Pablo Picasso in payment for the reproductions of Guernica and Three Musicians
Paris, 5 December 1953 - Personal correspondence Daniel-Henry Kahnweiler's letter to Pablo Picasso, dated 5 December 1953