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Parent materials (Rbep)

Materials (R)
    Classes of materials (Rb)
        Natural earth crust materials (Rbe)
            Deposits (Geology) (Rbeb)
            Weathered earth crust materials (Rbed)
            Parent materials (Rbep)
            Rocks (Rber)
                 Use For: Rock
            Soils (Rbes)
            Petroleum (Rbeu)
                 Related Term (Associative): Petroleum fuels (Rbffp)