Yapa, M.S.Karunaratne, V.2013-10-102013-10-102013Vidurava, 30(01):p.23-25https://dl.nsf.gov.lk/handle/1/9957Natural ResourcesNanomaterialsMineral resourcesEconomic developmentBeach sandsClay mineralsGraphiteNanotechnologyNanomaterials for economic developmentA