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Sen, S. (1978) Petrographic classification and codification of Indian coals. Journal of Mines, Metals & Fuels, 26 (4). pp. 168-173. ISSN 0022-2755

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Mukherjee, M. and Sen, S. and Gupta, S. (1966) A Study on the petrography and its Relation to Properties of Some Coals from the Chano-Rikba Area of the North Karanpura coalfield. Journal of Mines, Metals & Fuels, 14 (6). pp. 180-184. ISSN 0022-2755