National seminar on coal resources of India : proceedings, Varanasi, Dec. 27-29, 1986 / edited by Ram Murti Singh
National seminar on coal resources of India : proceedings, Varanasi, Dec. 27-29, 1986 / edited by Ram Murti Singh - - Varanasi Banaras Hindu University, 1987 - ix,637 p. 23.5 cm - .
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Coal mines and mining-Congresses
553.9(540) Nat:86