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Petroleum solids (Rbeus)

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)
                Petroleum solids (Rbeus)
                    Asphalt (Rbeusb)
                    Bitumen (Rbeush)
                         Related Term (Associative): 
                    Tar (Rbeusp)
                         Use For: Mineral tar
                         Related Term (Associative):