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absolute alcohol action of solvents alcohol extract amount aniline asphaltic benzene bituminous matter boiling point California shale carbon disulphide carbon-hydrogen ratio cent Chem chemical coal color Colorado shale compounds contained cracking crucible curve dark brown decomposed destructive distillation determined dissolved Elko endothermic evaporated exothermic extracted material extracted with absolute extraction apparatus filtered grams Grand Valley heat hydrocarbons hydrogen increase in weight indicated insoluble intermediate product kerogen laminae light yellow lignite liquid sulphur dioxide lone method Nevada nitrogen oil shale oil yield organic content organic matter original shale paraffin petroleum plant pyrite pyrobitumens pyrolysis quartz grains reaction reagents red selenium reduced pressure residue retort saturated selenium oxychloride semi-solid sericitic shale oil shale shows shale under reduced soluble soluble in alcohol solution solvents spores substance sulphur dioxide sulphuryl chloride temperature thermal decomposition tion torbanite treatment type of shale ultimate analysis unsaturated compounds vacuum distillation volatile matter yield of oil