1. Centre for Resource and Environmental Studies, Australian National University, PO Box 4, ACT 2600, Australia
2. Department of Geography, State University of New York at Buffalo, Buffalo, New York 14260, USA
3. Assessment Division, Transport and Road Research Laboratory, Crowthorne, Berkshire RG11 6AU, England
4. Department of Geography, University of Auckland, Auckland, New Zealand
5. Department of Geography, University College of Swansea, Swansea SA2 8PP, West Glamorgan, Wales
6. Department of Economics, University of Loughborough, Loughborough, Leicestershire LE11 3TU, England
7. School of Geography, University of Leeds, Leeds LS2 9JT, England
8. Department of Geography, University College London, 26 Bedford Way, London WC1H 0AP, England
9. Department of Geography, University of Lund, S-223 62 Lund, Sweden
10. Department of Geography, University of Glasgow, Glasgow G12 8QQ, Scotland
11. Department of Geography, University of Leicester, Leicester LE1 7RH, England