By Merttens, Ruth, Ruth Merttens, Dave Kirkby
By Arnell, Adam
By Bullen, Rob Kearsley
By Andrew Brodie
By Hunt, Rod, Brychta, Alex
By Oliver, Ray
By Pledger, Keith, Kent, Mr David
By Merttens, Ruth, Ruth Merttens
By School Mathematics Project
By Baudains, Richard, Baudains, Marjorie
By Whelan, Katie
By Parsons, Richard, Parsons, Richard, richard-parsons, Richard Parsons
By CGP Books, CGP Books
By Vivian French, Tim Archbold
By Greenwood, Marlene, Greenwood, Marlene
By Lynch, Emma
By Willis, Jeanne
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By Bull, Angela, Porter, Sue