Paris, 14 October 1955 - Institutional correspondence A letter from the Société de la Propriété Artistique et des Dessins et Modèles (S.P.A.D.E.M.) to the Musée des Arts Décoratifs
Paris, 2 November 1979 - Personal correspondence A copy of a letter Claude Picasso wrote to William Rubin, director of Painting and Sculpture at MoMA
Paris, 1 March 1975 - Personal correspondence Claude Picasso's letter to William S. Lieberman, dated 1 March 1975