Madrid, 24 September 1936 - Institutional correspondence Letter from Josep Renau to Pablo Picasso, 24 September 1936
ca. 1952–1957 - Internal museum documents Publicity report for the exhibition Studies for Guernica by the Cincinnati Art Museum, addressed to the Travelling Exhibitions Department at the Museum of Modern Art, New York
New York, 15 February 1967 - Management of reproduction rights Pearl L. Moeller's letter to Dorothy C. Miller