By DeFilippo, Judy, Walker, Michael
By Grundy, Peter, Maley, Alan
By Ackland, Jenny, Ripley, Ivan
By Odam, Professor George, etc.
By Howe, Linda
By Peter Patilla, Patilla, Peter
By Bentley, Diana
By Mayhew, James
By Kumon
By Chrisp, Peter
By Thomson, Ruth
By Leonard, M.G., M.G. Leonard
By IMPACT Project Uni Of N.London
By SPMG, Scottish Primary Maths Group
By Wren, Wendy
By Butterworth, John
By Watson
By Gibson, Janet
By Hughes, Susan
By Chris Watkins
By Gaunt, Norma, Whitwell, Jane, Bentley, Diana, Reid, Dee
By na, McArdle, Sean, Wren, Wendy
By Griffiths, Vivien, Copes, Lorraine, Murray, Maggie
By Lee, Vicki, Lloyd-Hall, Kirsty, Fairclough, Chris
By Smith, Peter, Inglis, A.
By Scarsbrook, Ailsa, Alan