By School Mathematics Project
By Ann Walker, Walker, Ann
By Tomkins, Stephen
By Diagram Group
By Styles, Morag
By Frank Smith
By Regan, Geoffrey
By Brown, Keith
By Herington, John
By Taylor, Dennis, Dennis Taylor
By Cornwell, Alan
By Reiss, Michael
By Wells, David
By Jones, Leo
By Hansom, J. D.
By Burnet, Lynn