Sarate OS, Basava Chary M. Petrographic evaluation of the coal seams from Gundala area, Godavari Valley Coalfield, Andhra Pradesh, India. JPS [Internet]. 2010 Dec. 31 [cited 2024 Oct. 2];59((1-3):81-90. Available from: https://jpsonline.co.in/index.php/jop/article/view/191