The Llandovery Series of the type area
Cocks, Leonard Robert Morrison Woodcock, Nigel H Rickards, Richard Barrie Temple, John Tempest Lane, Philip David, 1942-
Article
1984
Bulletin of the British Museum (Natural History) Geology
38
131--182
BioStor
English
London, BM(NH),
BioStor: https://biostor.org/reference/118616