Colombia and Venezuela are by far the most important oil producing countries of South America. In 1938, Venezuela ranked third among the oil producing countries of the world, with a yield of 190,000,000 barrels. Only the United States (1,265,000,000 barrels), and Russia (210,000,000 barrels) outrank that country. Colombia, with 22,000,000 barrels was ninth among the petroleum producing countries of the world.
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Ransone, William R.
"Oil Provinces of Colombia And Venezuela,"
Field and Laboratory: Vol. 7
Available at: https://scholar.smu.edu/fieldandlab/vol7/iss2/1