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एमएलए (9वां संस्करण) प्रशस्ति पत्रIndia. Dept. of Public Enterprises. Ministry of Heavy Industries and Public Enterprises. Public Enterprises Survey, 2006-2007: Annual Report on the Performance of Central Public Sector Enterprises. Dept. of Public Enterprises, Ministry of Heavy Industries and Public Enterprises, Govt. of India, 2008.