New York, 30 August 1979 - Institutional correspondence A letter from Ethen Shein to Richard E. Oldenburg
2004 - Photograph Maya Picasso and Diana Widmeyer Picasso contemplate the Guernica tapestry at Atelier Picasso, Paris
September, 1981 - Management of reproduction rights Memorandum of understanding between the Museum of Modern Art, New York, and Undersigned