Author: HOWELL, B.F. & C.J. STUBBLEFIELD
Title: A revision of the fauna of the North Welsh Conovoryphe viola beds implying a Lower Cambrian age.
Description: 1950. Geol. Mag. LXXXVII; pp. 1-16, 2 plts. h.t. with fossils (mostly trilobites) Orig. extract, stapled, very good.

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