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Asphalt rock (Rbeusbf)

Materials (R)
    Classes of materials (Rb)
        Natural earth crust materials (Rbe)
            Petroleum (Rbeu)
                 Related Term (Associative): Petroleum fuels (Rbffp)
                Petroleum solids (Rbeus)
                    Asphalt (Rbeusb)
                        Asphalt rock (Rbeusbf)
                             Use For: Natural rock asphalt; Rock asphalt
                        Trinidad asphalt (Rbeusbt)
                             Use For: Lake asphalt