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Petroleum liquids (Rbeum)

Materials (R)
    Classes of materials (Rb)
        Natural earth crust materials (Rbe)
            Petroleum (Rbeu)
                 Related Term (Associative): Petroleum fuels (Rbffp)
                Petroleum gases (Rbeug)
                Petroleum liquids (Rbeum)
                    Crude oil (Rbeumc)
                    Maltha (Rbeumm)
                         Use For: Earth pitch; Malthite
                Petroleum solids (Rbeus)