1. Oil Shale;Dickson,1981
2. Solubilities of oil shales in solvents for petroleum;Gavin;U.S. Bur. Mines. Rep. Invest.,1922
3. Solvent extraction of Torbanite;Dulhunty,1942
4. Bituminous material from oil shale;Ryan,1920
5. Hydrocarbons from bituminous shale-like material;Hampton,1928