In which of the following countries mineral oil was commerci

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M: +2.00/-0.50

In which of the following countries mineral oil was commercially drilled in 1857 ?

R.A.S./R.T.S.(Pre) 2013

[Earth - Tropics, Volcanoes, Tides, cyclones, Corals ETC. Part 8]

U.S.A.

Venezuela

Indonesia

Romania

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