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Raley, Fuel, vol. 59, Jun. 1980, pp. 419-424.;  Nekut et al. "Rotating Magnet Ranging-A New Drilling Guidance Technology", Vector Magnetics, Presentation, Jun. 2000, p. 1-24.;  New System Stops Paraffin Build-up; Petroleum Engineer, Eastlund et al., Jan. 1989, (3 pages).;  New in situ shale-oil recovery process uses hot natural gas; The Oil & Gas Journal; May 16, 1966, p. 151.;  Oejrot et al., "The Shale Oil Industry in Sweden," Carlo Colombo Publishers-Rome, Proceedings of the Fourth World Petroleum Congress, 1955 (8 pages).;  Oil Shale Retorting: Effects of Particle Size and Heating Rate on Oil Evolution and Intraparticle Oil Degradation; Campbell et al. 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