Yonkers, 20 March 1969 - Institutional correspondence Donald M. Jr. Halley's letter to Nelson Rockefeller
22 November 1980 - Institutional correspondence Rafael Fernández Quintanilla's letter to Javier Tusell, dated 22 November 1980
ca. 1952–1956 - Internal museum documents Publicity report for the exhibition Studies for Guernica by Arkansas University, addressed to the Travelling Exhibitions Department at the Museum of Modern Art, New York