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J. J. Wilkinson1, A. J. Boyce2, G. Earls3, A. E. Fallick4 |
1. Earth Sciences and Engineering, Royal S chool of Mines, Imperial College, UK; 2. Isotope Geosciences Unit, Scottish Universities Research and Reactor Centre, Scotland; 3. Crowe, Schaf falitz ky and Associates Ltd., Ireland; 4. Isotope Geosciences Unit, SUR RC, Scotland |
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Received: 20 October 1999
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