Paris, 27 February 1958 - Institutional correspondence Daniel-Henry Kahnweiler's letter to Alfred H. Barr Jr., dated 27 February 1958
London, 7 March 1958 - Management of reproduction rights A letter from Diana K. Watson to Richard Griffith
New York, 26 April 1962 - Insurance documents Alfred H. Barr Jr.'s letter to Daniel-Henry Kahnweiler, dated 26 April 1962