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ACKNOWLEDGEMENTS We should like to thank Dr. Wagenbreth for supplying us with unpublished data. We also wish to record our appreciation of those organizations whose financial support has enabled the Project Centre to co-ordinate the work of this Project, including the prepara- tion of this volume. These include the Academy of Sciences of the USSR, Air Liquide, BOC Ltd., Imperial Chemical Industries Ltd., Shell Research Ltd., BP Trading Ltd., and Sulzer Brothers Ltd. We are particularly grateful to the Department of Industry of the United Kingdom, who provide the major share of the finance, and to the Imperial College of Science and Technology of London for providing accommodation and services. 61