De Silva, T.K.N.P.Mendis, D.L.O.Wickramanayake, V.E.A.Uragoda, C.G.2010-07-062010-07-061995https://dl.nsf.gov.lk/handle/1/5269Soil ErosionAncient ruinsWater ConservationScientific PrinciplesHealth PrinciplesSri LankaArchitectureEducationScientific Principles seen in ancient artefacts and monumental structures