14 June 1973 - Personal correspondence Roland Penrose's letter to Alfred H. Barr and Margaret Scolari Barr
1973 - Internal institutional documents A report on the ownership of Guernica and a possible transfer to Spain
Homenaje a Picasso... Mucha luz se ha perdido - Lithograph Omaggio a Picasso... Molta luce è andata perduta
New York: Praeger Publishers Inc., 1973 - Essay Six Years: The Dematerialization of the Art Object from 1966 to 1972
Cambridge, Massachusetts, 14 May 1973 - Institutional correspondence Catherine Freedberg's letter to Patricia Failing
New York, 6 August 1973 - Institutional correspondence A letter from Betsy Jones to Daniel-Henry Kahnweiler
![Lucy R. Lippard, <em>Six Years: The dematerialisation of the art object from 1966 to 1972</em> [1973], Berkeley: University of California Press, 1997](/sites/default/files/styles/medium/public/documento/FF-124_0.jpg?itok=GRRD9XHM "Lucy R. Lippard, <em>Six Years: The dematerialisation of the art object from 1966 to 1972</em> [1973], Berkeley: University of California Press, 1997")
