| Description | /1. 1 x ts. letter, 31 October 1979, from Dr. John Haffenden of the University of Sheffield to Roland Penrose, 1p.
/2. 1 x ts. letter, 29 January 1980, from Dr. John Haffenden of the University of Sheffield to Roland Penrose, 1p.
/3. 1 x ts. letter, 14 February 1980, from Roland Penrose to Dr. John Haffenden of the University of Sheffield, 1p.
/4. 1 x ts. letter, 31 July 1980, from Dr. John Haffenden of the University of Sheffield to Roland Penrose, 1p. |