R. K. SINGH, K. N. SINGH, S. K. DHANORIA, A. BHATT, and A. DIXIT. 2010. “Petrochemistry and Depositional Environment of Permian Coals of Basundhara Block, Ib-Valley Coalfied, Orissa,India”. International Journal of Economic and Environmental Geology 1 (1):36-41. https://doi.org/10.46660/ijeeg.v1i1.645.