California produces oil from natural resources in three ways: (1) drilling to underground reservoirs from which oil flows or is pumped; (2) extraction, by means of solvents from bituminous rock; and (3) destructive distillation of oil shale. The first method is, of course, the most important. The second is practically of no interest now, for while California has numerous easily accessible deposits of bituminous rock, the process of extraction is comparatively costly. The third process is becoming more important as the oil obtained from bituminous shale is peculiarly adapted to use as flotation oil, an oil used in the recovery...

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