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CH Holland & MG Bassett 1989. A Global Standard for the Silurian System. National Museum of Wales Geological Series no. 9 and International Union of Geological Sciences Publication no. 23. 325 pp. Orders to: Bookshop Manager, National Museum of Wales, Main Buildings, Cathays Park, Cardiff CF1 3NP, UK Price£ 39.50 plus postage (£ 2.50 UK,£ 3.50 overseas). Orders to be accompanied by cheque/draft drawn in pounds sterling on a British bank. 0 7200 0308 3 (hard covers).