The Cambrian-Ordovician boundary: Sections, fossil distributions, and correlations
Bassett, M.G.; Dean, W.T. (Ed.) (1982). The Cambrian-Ordovician boundary: Sections, fossil distributions, and correlations. Geological Series, 3. National Museum of Wales: Cardiff. ISBN 0-7200-0253-2. 227 pp.
Part of: Geological Series. National Museum of Wales: Cardiff. ISSN 0962-0575, more
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