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xiii Acknowledgements Though the writing of this monograph has been done largely from published materials, a great deal of the information has been derived from field research, both formal and informal, extending over more than 15 years. So many are my informants that I hope they will accept my thanks in general rather than in particular. Nevertheless I would like to single out some for special mention: Tuan Haji Ani b. Arope, Director, Rubber Research Institute Dr Brian J. Wood, Chemara Research Station Mr Lee Keng Fatt, Agricultural Statistician, Department of Agriculture, Kuala Lumpur The figures were drawn by the staff of the Cartographic Unit, Department of Geography and Geology, University of Hong Kong, namely Messrs. H.K. Kwan, T.B. Wong and H.K. Chiu, while the photographic work was done by Mr K.B. Cheung, also of that Department. Mr Roger K. Hill assisted in the compilation of the bibliography and Miss Ngaire L. Hill with arranging the manuscript which was most efficiently typed by Mrs Meimei Cheung. To all go my thanks. R.D. Hill Hong Kong, July 1979 Unavoidable delays in publication have permitted the revision of certain statistical tables and the text based upon them. The latest available data have been used whenever possible though in the interests of valid comparisons , those for earlier years had to be used in some instances. R.D. Hill Singapore, July 1981 ...

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