New York, 6 July 1939 - Institutional correspondence Alfred H. Barr Jr.'s letter to Pablo Picasso, dated 6 July 1939
New York, 10 July 1939 - Institutional correspondence Evelyn Ahrend's letter to Marcelene Peterson, dated 10 July 1939
Gothenburg, 26 April 1938 - Institutional correspondence Tor Bjurstöm's letter to Sven Strindberg, dated 26 April 1938