London, 18 April 1980 - Institutional correspondence Nicholas Serota's letter to Roland Penrose, dated 18 April 1980
London, 1 May 1980 - Institutional correspondence Nicholas Serota's letter to Roland Penrose, dated 1 May 1980
London, 21 January 1939 - Personal correspondence Roland Penrose's letter to Pablo Picasso, dated 21 January 1939
London, 26 March 1939 - Personal correspondence Roland Penrose's Letter to Pablo Picasso, dated 26 March 1939
Paris, 28 March 1939 - Personal correspondence Pablo Picasso's letter to Roland Penrose, dated 28 March 1939
London, 15 April 1939 - Personal correspondence Roland Penrose's letter to Pablo Picasso, dated 15 April 1939
