Ragga, Philip Wani Marchelo-d’, and Pio Kur Deng. “The Characterization of Heavy Mineral Composition in Some Soils Representing Clay Plains of the Sudan”. GPH-International Journal of Agriculture and Research 2, no. 02 (February 28, 2019): 01-18. Accessed October 13, 2025. https://www.gphjournal.org/index.php/ar/article/view/173.