Which is common to Guwahati, Barauni, Koyali, Haldia, Digboi and Mathura?

Which is common to Guwahati, Barauni, Koyali, Haldia, Digboi and Mathura? Correct Answer Public sector refineries, owned by the Indian oil corporation are located in these places

In Guwahati, Barauni, Koyali, Haldia, Digboi and Mathura, public sector refineries, owned by the Indian oil corporation are located in these places.

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