Chapter 25 'Medical Physics' in Twentieth Century Physics Group of papers under the title 'Medical Physics' which includes: 1) Chapter 25 in volume 3 of Twentieth Century Physics entitled "Medical Physics"and written by Professor Mallard (Institute of Physics, London, 1995). 2)Group of papers including a flyer for the book, a list of people to send reprints to and a with compliments slip for Institute of Physics Publishing. 3)Correspondance with Professor Mallard relating to the publication of the chapter. 1995-1998