Geology of the country around Tewkesbury : memoir for the 1:50 000 geological sheet 216 (England and Wales) / B.C. Worssam, R.A. Ellison and B.S.P. Moorlock ; contributors A.J.M. Barron, R.J. Wyatt. - Worssam, B. C. (Bernard Charles) (H.M.S.O., 1989)