M. DARSHANA & S. P. R. SAMANTHIKA. RIVER SAND AND SEA SAND MINING INDUSTRIES IN SRI LANKA. International Journal of Research Science and Management, [S. l.], v. 4, n. 9, p. 1–9, 2017. Disponível em: http://ijrsm.com/index.php/journal-ijrsm/article/view/468. Acesso em: 23 dec. 2024.