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Acknowlodgements. The author thanks the Swedish International Development Agency, Stockholm and the International Rural Development Centre, SUAS, Uppsala for financial support. I also wish to thank Dr Jeremy Flower-Ellis for substantial help with the English.
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First submitted 15 May 1996. Accepted for publication after revision 10 January 1997
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First submitted 15 May 1996. Accepted for publication after revision 10 January 1997.
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