hide e ONGC English Oil & Natural Gas Corporation Ltd. English Oil and Natural Gas Corporation 3 See also http://en.wikipedia.org/wiki/Oil_and_Natural_Gas_Corporation 4 References Oil and Natural Gas Corporation Oil and Natural Gas Corp. (ONGC) English c en 2 International rankings http://en.wikipedia.org/wiki/Oil_and_Natural_Gas_Corporation b English English English en.wikipedia.org/wiki/Oil_and_Natural_Gas_Corporation a a ONGC (India) en Oil and Natural Gas Corporation English ONGC (India) d Oil and Natural Gas Corp. (ONGC) en English 5 External links English English hide English Oil and Natural Gas Corporation Limited English en:Oil and Natural Gas Corporation 1 ONGC Videsh ONGC (India) b