Clarkson, E.N.K. Invertebrate palaeontology and evolution/ E.N.K. Clarkson - 4th.ed. - New Delhi: Blackwell science, 1998. - 452 p. ISBN: 9788126533084 Subjects--Topical Terms: Invertebrate Palaeontology Dewey Class. No.: 562 / CLA/I