HUSAIN , V. ., . S. . SULTAN, . . R. . BILQEES, A. MATEEN, and . B. . KHAN. “PEtROGRAPHIC AND GEOCHEMICAL STUOIES OF SOME PHOSPHORITE ’- DEPOSITS OF HAZARA, PAKISTAN”. Biological Sciences - PJSIR, vol. 37, no. 6-7, June 2022, pp. 245-51, https://v2.pjsir.org/index.php/biological-sciences/article/view/2675.