New York, 10 July 1939 - Institutional correspondence Blanche Mahler's letter to Grace L. McCann Morley
2 May 1939 - Internal institutional documents A draft text for the invitation to the exhibition Picasso's Guernica at the Valentine Gallery, New York
ca. 1960–1964 - Newspapers Press cutting with a photograph of the replica Guernica tapestry and Nelson Rockefeller, along with a brief text on his collection