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
21 December 2014 - Photograph Demonstration againt the Ley de Seguridad Ciudadana, also known as "ley mordaza"