Sarate OS. Petrographic analysis and depositional environment of subsurface coal seams of Koyagudem area, Godavari Valley Coalfield, Telangana, India. JPS [Internet]. 2015 Dec. 31 [cited 2024 Nov. 23];64((1-2):151-6. Available from: https://jpsonline.co.in/index.php/jop/article/view/110