1956 - Conferences and articles Text by Emil Langui for the exhibition catalogue Guernica, avec 60 études
1956 - Conferences and articles Text by Kahnweiler for the exhibition catalogue Guernica avec 60 études
New York, 8 May 1956 - Institutional correspondence Carol K. Uht's letter to Petro (Nelly) Van Doesburg
Horseheads, New York, 23 January 1956 - Management of reproduction rights Hugh Thomas's letter to Alfred H. Barr Jr.