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The preparation of this volume has been a collective effort. In addition to the cooperation received from the contributors themselves in my repeated requests for more information or clarification, the assistance of a number of others is acknowledged. The United Nations University funding made the whole endeavour possible, but thanks are due in particular to Fu-chen Lo and Jacob Park. Assistance with the organization of the planning meeting was given by Professor Mahmoud Yousry and with the mid-project meeting by Professor Alan Gilbert and Keith Rudkin of the Department of Geography, University College London. I am indebted to the referees, Professor Akin Mabogunje and Dr. Tony O'Connor, whose comments were invaluable, but who cannot be held responsible for the final product. Technical assistance with the production of maps and diagrams and other support were provided by the technical and administrative staff of the Department of City and Regional Planning, University of Wales, Cardiff, and Catherine Jele competently and quickly translated between French and English where necessary.