A global analysis of the Ordovician-Silurian boundary
Cocks, L.R.M.; Rickards, R.B. (Ed.) (1988). A global analysis of the Ordovician-Silurian boundary. Bulletin of the British Museum (Natural History). Geology, 43. British Museum (Natural History): London. ISBN 0-565-07020-7. 394 pp.
Part of: Bulletin of the British Museum (Natural History). Geology. British Museum of Natural History: London. ISSN 0007-1471, more
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