By Cynthia Rider
By Ernest Baldwin
By J. C. P. Miller
By School Mathematics Project
By Stranks
By Michael Yudkin, Yudkin, Michael
By Denbigh
By F. L. Milthorpe
By Pat Bryden, Cliff Pavelin, Bryden, Pat, Pavelin, Cliff
By Brunnée, Jutta
By K. A. Tsokos
By Jeremy Price
By Richard Harwood, Ian Lodge, Harwood, Richard, Lodge, Ian
By F. W. Rawding
By Ian Atkinson
By Sophocles
By Magnus J. Wenninger
By Hamlyn G. Jones
By Roy Edwards, Jean Clark, Alice Dickson, Barbara Hewett, Barbara White
By W. N. Christiansen, J. A. Högbom
By Carol A. Seymour, Seymour, Carol A.