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2. J. M. Marsh, and J. W. Lloyd . 1979 . Trace element behaviour in a limestone aquifer . International Association of Hydrogeologists, Monograph II on Karst Hydrology (in press).
3. J. M. Marsh, 1978 . The hydrochemistry of some British aquifers with special reference to trace elements. Ph.D. Thesis. Dept. of Geological Sciences, University of Birmingham. 344 pp.