By Anon
By Berrondo-Agrell, Marie
By Price, Anne
By Macdonald, Ian, Maclellan, Ronnie, McDonald
By School Mathematics Project
By Now National Writing Gro, Maths
By W R J Waite, David Turner, Ian Potts, Viv Hony, Waite, W R J, Turner, David, Potts, Ian, Hony, Viv
By Ball, Barbara, etc.
By CGP Books
By Cassell, David
By Unknown
By Bird, Marion
By Chris Humble, Fiona McGill, Humble, Chris, McGill, Fiona
By Noonan, Jim, Bevis, Terry, Cain, Gay, Martin, Brian, Mitchell, Christine, Powell, Robert, Wood, Gwen
By Fielker, David
By Koshy, Valsa, Murray, Jean
By Allison, Anne
By Sykes, Bob
By DK
By O'Meara, David