Bharadwaj, D.C., and S.C. Srivastava. “Sporological Correlation of Coal Seams in Bisrampur Coalfield, M.P., India”. Journal of Palaeosciences 18, no. 1-3 (December 31, 1969): 87–94. Accessed November 4, 2024. https://jpsonline.co.in/index.php/jop/article/view/822.