Levorsen, A.I. . Geology of Petroleum / Textual Documents A.I. Levorsen. - 2nd ed. / - Delhi : CBS Publishers & Distributors , 1985. - x, 724p. : ill. ; 22cm . Index ISBN: HB Subjects--Index Terms: Geology Petroleum Petrology PG-Geology Dewey Class. No.: 550 / Le 579 Ge