ABSTRACT
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Liquid fuels are produced from several sources, the most common being petroleum. However, other sources such as oil sand (Berkowitz and Speight, 1975; Speight, 1990, and references cited therein) and coal are also viable sources of liquid fuels. Coal, to a lesser extent, can also be used as a source of liquid fuels (Speight, 1994, and references cited therein).
