Author: Elles, G.L., 1900.: Title: The zonal classification od the Wenlock Shales of the Welsh Borderland.
Description: Quart. Jour. Geol. Soc., 56: pp. 370-414, 11 figs. of graptolites on 1 plate, 11 tables and 24 figs. (partly of graptolites), notes & refs. Plain new wrappers.
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- Book number: 16954