By DEEM
By Jon Scaife, J. J. Wellington
By KEEN J H
By Moyles, .
By Michael Taylor, Tania Chung
By Marilyn Lewis
By Caroline Currer
By Medecins Sans Frontieres
By Malcolm Hamilton
By P. Bonner, L. Aston
By Cathy Hull
By G.D. Buckwell
By John Baylis
By Alan Barker
By Norman Lucking
By Pauline Alderson, Martin Rowland, Alderson, Pauline, Rowland, Martin
By Jack Richardson, Wendy Richardson, Richardson, Jack, Wendy
By J. Vaughan
By Jennifer Vaughan
By Neil Ardley
By Michael Pollard
By Chris Gayford, Gayford, Chris
By Charles Went, Went, Charles
By Gordon Elliott, K. Martin, Elliott, Gordon, Martin, K.
By Elza Margrain, etc.
By Peter Calow
By J. S. Gale
By S.E. Hodge, M.L. Seed, Scottish Mathematics Group, Hodge, S.E., Seed, M.L.