http://pec.lib.wvu.edu/record/P8011952Coal hydrogenation process unlocks vast aromatics field. Journal article reprint from: <em>Chemical Engineering</em>, 1952:June. "Compliments of Carbide and Carbon Chemicals Company, a division of Union Carbide and Carbon Corporation." Carbide and Carbon Chemicals Company (Institute, W. Va.)Hydrogenation.Coal liquefaction.14256