Author: Blake, J.F., 1888.:
Title: On the Monian system of rocks.
Description: Quart. .Jour. Geol. Soc. London, 44: pp. 463-547, 1 folding map (Island of Anglesey), 25 figs. of sections in text, refs. Paperbound, plain new wrappers. - First reference to the Monian subsystem on Anglesey. Scarce.

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