By McGuire, Peter, Smith, Ken
By Webber, Beryl, Haigh, Jean
By Andrew Baines
By Brighouse, Alan, etc., Godber, Patilla
By Brodie, Andrew
By Scottish Primary Mathematics Group
By Parsons, Richard, Richard Parsons
By Tipler, M. J.
By Gordon, Keith
By Kearsley Bullen, Rob, Edmondson, Andrew, Ward, Tony