By Advanced Physics Project for Independent Learning
By Bruce Campbell, Frances Hawker
By Rayner, D.
By Swart, K. W.
By Schofield & Sims, T R Goddard, J W Adams, R P Beaumont
By D J Ward
By Taylor Downing
By Wilson, Neil
By Morgan, Dian, Patton, Mark
By Harrold, Jenni
By Sauvain, Philip, Rowe, Eric
By Pedretti, Mara, Stephenson, Helen, Cook, Rolf
By McDonald, H.Simmons-, etc.
By John David Rhodes
By Watson, Jack B.
By Wright, Walter D.
By Pearce, Malcolm L., Stewart, Geoffrey
By Case, S.L., Hall, David John
By Ridgway, Bill
By Merttens, Ruth, Ruth Merttens, Dave Kirkby
By Merttens, Ruth, Ruth Merttens
By Anon
By Ridout, Ronald, Adamson, George
By Ridout, Ronald
By School Mathematics Project
By Jones, Geoff., Mary Jones, Phillip Marchington and David Acaster., Geoffrey, Mary, Marchington, Phillip, Acaster, David, Phillip Marchington and David Acaster. Jones