Shah MR, Abbasi IA, Haneef M, Khan A. Nature, origin and mode of occurrence of Hangu-Kachai area coal, district Kohat, NWFP, Pakistan: A preliminary study. jhes [Internet]. 1993Nov.30 [cited 2025Jan.4];26(1):87-94. Available from: http://ojs.uop.edu.pk/jhes/article/view/1446