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- 20:08, 31 January 2019 Debra Tabron (talk | contribs) uploaded File:1980- Somerton- Role of Clays in the enhanced reovery of petroleum.pdf (<ref>Somerton, W. H., and C. J. Radke. 1980. Roles of clays in the enhanced recovery of petroleum. Proceedings of the first joint SPE/DOE symposium on enhance oil recovery. Society of Petroleum Engineers.</ref>)