Amarasekera, J.Sooriyakumaran, R.Ismail, M.G.M.U.2010-07-062010-07-061981Journal of the National Science Council of Sri Lanka, 9(1):p.55-76https://dl.nsf.gov.lk/handle/1/6475Chemical analysisFertilizersMineral depositsCalcinationSuperphosphateGeologyPreliminary laboratory studies on Eppawela apatiteArticle