Prepared by a Course Team for the Open University. prepared by Roger Spear for the Course Team. prepared for the course team by Ruth and David Elliott. prepared by a Course Team from the Faculties of Technology and Science. prepared by the Cartographic Department of the Oxford University Press. prepared by Dick Morris for the Course Team. prepaed for the course team by Robin Roy. prepared by Lyn Jones for the Course Team. prepared by Paul Walpole for the Course Team. prepared for the course team by Alan Thomas.