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Petroleum fuels (Rbffp)

Materials (R)
    Classes of materials (Rb)
        Fuels (Rbf)
            Fossil fuels (Rbff)
                Coal fuels (Rbffe)
                Petroleum fuels (Rbffp)
                     Related Term (Associative): Petroleum (Rbeu)
                    Kerosene (Rbffpk)
                         Use For: Kerosine
                    Natural gas (Rbffpn)
                    Liquefied petroleum gas (Rbffpp)
                         Use For: LPG