By Domoney, Bill, Gash, Peter, Harrison, Paul, James, Lorely, Sawyer, Ann, Wright, Diana
By Briten, Paul
By McArdle, Sean
By School Mathematics Project
By Durell, C. V.
By Hatch, Gillian
By Fraser Et Al, F
By Kirkby, David
By Shaw, Don, Shiels, John
By Sean McArdle, McArdle, Sean
By Murray, Les
By Koll, Hilary, Mills, Steve