Author: COCKS, L.R.M. & R.B. RICKARDS (EDS.)
Title: A global analysis of the Ordovician-Silurian boundary.
Description: 1988. Bulletin of the British Museum (Natural History) Geology Vol. 43; 394 pp. many fig./phot./plts. Orig. wrps. with small libr. stamp and trace of removed ticket, otherwise and contents very good.

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