India. Ministry of energy. Department of coal. (1981). Committee on public undertakings (1981-82): Thirtieth report. Lok Sabha.
Chicago Stili AlıntıIndia. Ministry of energy. Department of coal. Committee on Public Undertakings (1981-82): Thirtieth Report. New Delhi: Lok Sabha, 1981.
MLA AlıntıIndia. Ministry of energy. Department of coal. Committee on Public Undertakings (1981-82): Thirtieth Report. Lok Sabha, 1981.
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