A Monograph of the Ordovician Trilobites of the Bala Area, Merioneth
- 31 December 1962
- journal article
- other
- Published by Taylor & Francis in Monographs of the Palaeontographical Society
- Vol. 116 (497) , 1-32
- https://doi.org/10.1080/25761900.2022.12131686