The Upper Palaeozoic and post-Palaeozoic rocks of Wales : published in memory of Sir Arthur Trueman, and also to celebrate the fiftieth anniversary (1920-1970) of the Department of Geology, University College of Swansea - Trueman, A. E. (Arthur Elijah), Sir, 1894-1956; Owen, T. R. (Thomas Richard) (University of Wales Press, 1974)