Sladen, W. Percy A monograph on the British fossil Echinodermata from the Cretaceous formations - London Palaeontographical Society 1864-1905 - 3 v. 65 láms. Subjects--Topical Terms: CRETACEOECHINODERMATAPALEONTOLOGÍA Subjects--Geographic Terms: INGLATERRA Universal Decimal Class. No.: 563.9(116.3:420)/P19