Sarate, Omprakash S., and M. Basava Chary. 2010. “Petrographic Evaluation of the Coal Seams from Gundala Area, Godavari Valley Coalfield, Andhra Pradesh, India”. Journal of Palaeosciences 59 ((1-3):81-90. https://doi.org/10.54991/jop.2010.191.