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Varma, A.K. Applied coal petrology: The role of coal petrology in coal utilization. Isabel Suárez-Ruiz and John C. Crelling (Eds.). J Geol Soc India 74, 652–653 (2009). https://doi.org/10.1007/s12594-009-0181-y
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DOI: https://doi.org/10.1007/s12594-009-0181-y