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Petroleum gases (Rbeug)

Materials (R)
    Classes of materials (Rb)
        Natural earth crust materials (Rbe)
            Petroleum (Rbeu)
                 Related Term (Associative): Petroleum fuels (Rbffp)
                Petroleum gases (Rbeug)
                    Natural gas (Rbeugn)
                Petroleum liquids (Rbeum)
                Petroleum solids (Rbeus)