By Hadkins, Helen, Lewis, Samantha
By Redston, Chris, Cunningham, Gillie
By Richards, Jack C., Hull, Jonathan, Proctor, Susan
By Hart, Brian, Rinvolucri, Mario, Puchta, Herbert, Stranks, Jeff
By Puchta, Herbert, Stranks, Jeff
By Ackroyd, Sarah, McDonnell, Peter
By Goodey, Diana, Noel, Bolton, David
By Not Available
By Ackroyd, Sarah, Levy, Meredith
By Bradshaw, David
By Davies, P. C. W.
By Davies, Paul
By Various others, Brown, Richard, Ruttle, Kate, Glasberg, Jean
By samons II, Loren J.
By Phillips, Andrew
By Ansell, Ben W.
By Baldez, Lisa
By Bulmer-Thomas, Victor
By E A Maxwell
By School Mathematics Project
By Unknown
By Littlejohn, Andrew, Hicks, Diana
By Tanner, Duncan