00495    a2200157   4500020001800000082002000018100002300038245006400061260003800125300002300163650001400186650002800200650004000228650002700268650004200295  a9789556651409  a909.095493bDES  aDe Silva, M. Asoka  aEvolution of technological innovations in ancient Sri Lanka  aColombobVijitha Yapac2011g2011  axxv, 444p..c24cm.  aSri lanka  aCiviliztion - Sri Lanka  aTechnological innovation  Sri Lanka  aTechnology - Sri Lanka  aTechnology - Civilization - Sri Lanka