Deraniyagala, S. U. The prehistory of Sri Lanka : an ecological perspective / S. U. Deraniyagala - Michigan : UMI Dissertation information service, 1989 - 3 v. : ill., maps ; 31 cm. - Memoir ; v. 8 . Thesis (Ph. D.) - Harvard University ISBN: USD 59.22 Subjects--Topical Terms: Prehistoric peoples--Sri Lanka Subjects--Geographic Terms: Sri Lanka--Antiquities Dewey Class. No.: 954.93