| Description | Correspondence relating to the production of the publication, Wills, L J (ed), 'A Palaeogeological Map of the Palaeozoic Floor below the Permian and Mesozoic formations in England and Wales : with inferred and speculative reconstructions of the Palaeozoic outcrops in adjacent areas as in Permo-Triassic times', Memoir no.7, Geological Society (1973). |