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Abraham7 acid refining addition ammonia apparent aromatic hydrocarbons asphaltic substances bitu bituminous matter bituminous sub bituminous substances Blown Asphalt boiling fractionations boiling point bons Brooks12 carbon disulfide chain fractionating Chem chemical combustion analyses compounds concluded contain crude data found decomposition density depolymerization destructive distillation exposure extraction formation found in Table fraction 25 further GRAFTON PUBLISHING hydro hydrocar hydrocarbon fractionations hydrogen indicate instances isomeric Krieble and Seyer less light Literature Cited McKee1 molecular weight naphthenic acids native asphalts nature odor oil portions oil shales oily hydrocarbons oxidation paraffin hydrocarbons paraffin wax petrol petrolene hydrocarbons petroleum ether petroleum resins petroleums and bituminous polymerization present pyridine refined Trinidad residual asphalts Richardson sample separation of paraffin shale oils solid paraffin solvent special investigation sulfur dioxide sulfuric acid Tar Sands temperature terpene tion Trinidad asphalt Trinidad fractionations Trinidad Lake asphalt U. S. Bureau vacuo vacuum distillation viscosity viscosity curve volatile Water-White Hydrocarbons