Paris, 10 February 1955 - Institutional correspondence Daniel-Henry Kahnweiler's letter to Alfred H. Barr Jr., dated 10 February 1955
Pars, 9 February 1955 - Institutional correspondence Pablo Picasso's letter to Alfred H. Barr Jr., dated 9 February 1955
New York, 4 March 1955 - Institutional correspondence Alfred H. Barr Jr.'s letter to Maurice Jardot, dated 4 March 1955
New York, 5 May 1955 - Institutional correspondence A letter from Alfred H. Barr Jr. to Pablo Picasso, dated 5 May 1955
Exhibition, MoMA, New York, June 2, 1967 – February 13, 1968 - Photograph View of the exhibition Guernica: Studies and Postscripts