A monograph of the Ordovician Trilobites of the Bala area, Merioneth.
Contributors: Palaeontographical Society.
Series: Palaeontographical Society Monographs
Publisher: Palaeontographical Society
Published: 1962
Place of publication: London
Language: eng
Notes: Parts 1 & 2 published 1962 and 1965. Parts 3 & 4 published as nos. 512 and 520 in vols. 120 and 122 for 1966 and 1968.