New York, 10 February 1956 - Institutional correspondence A letter from Louise A. Boyer to Petro (Nelly) Van Doesburg
New York, 14 November 1939 - Institutional correspondence Nelson Rockefeller's telegram to Pablo Picasso
Horseheads, New York, 23 January 1956 - Management of reproduction rights Hugh Thomas's letter to Alfred H. Barr Jr.