Ratang, Sarlota. “Public Perception The Impact Of People Activities in Sand And Stone Mining on Economy and Environment in Nulokla Village Jayapura”. Advances in Social Sciences Research Journal 4, no. 24 (December 24, 2017). Accessed November 23, 2024. http://116.203.177.230/index.php/ASSRJ/article/view/3644.