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by Editor: P. L. DeBoer (Dr P L de BoerInstitute of Earth SciencesState University of UtrechtPO Box 80.021NL 3508 TA UtrechtThe Netherlands); Editor: D. G. Smith
by Editor: P. N. Preston (Heroit-Watt Univ. Edinburg, Scotland with Contributions by D. M. Smith, Univ. of St. Andrews, Scotland; M.F.G. Stevens, Univ. of Aston, Birmingham, England; and G. Tennant, Univ. of Edinburgh)