By School Mathematics Project
By Stephen Bell, Peter Brown, Steven Buckley, Bell, Stephen, Brown, Peter, Buckley, Steven
By Roland Soper, David Sparks, Soper, Roland, Sparks, David
By Roy Edwards, Mary Edwards, Alan Ward
By Colin Goldsmith, David Nelson, School Mathematics Project
By Brian Bolt, Bolt, Brian
By Mike Savage, Julian Williams
By Alan R. Townsend
By Colin Vout, Gordon Gray
By Anglesey Language Studies Centre
By Douglas Quadling, Hugh Neill