Group of papers relating to Chapter 25 'Medical Physics' in Twentieth Century Physics Group of papers including a publicity flyer for the book, a handwritten list of people to send reprints to, a programme for and handwritten notes from a seminar entitled 'The history of Ultrasound' by Malcolm Niolson and a 'with compliments' slip for Professor Mallard from the Institute of Physics Publishing which accompanied his copy of the chapter. These copies are the original papers. 1995