New York, 28 February 1974 - Institutional correspondence A letter from the Guerrilla Art Action Group to Richard Oldenburg
New York, 5 March 1974 - Institutional correspondence Letter-poem by the Guerrilla Art Action Group send to Franco
New York, 5 June 1939 - Institutional correspondence Evelyn Ahrend's letter to Alfred H. Barr Jr., dated 5 June 1939
New York, 14 June 1939 - Institutional correspondence Evelyn Ahrend's letter to Alfred H. Barr Jr., dated 14 June 1939
