Piyadasa, R.U.K.Naverathna, C.M.2015-04-022015-04-022008Piyadasa, Ranjana U.K. and Naverathna, Campa M., 2008. Assessment of environmental impacts due to river sand mining, In: Proceedings of the International Conference on Social Sciences, Sri Lanka, University of Kelaniya, pp 120.http://repository.kln.ac.lk/handle/123456789/6704enArticle