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Anthracite (Rbersb)

Materials (R)
    Classes of materials (Rb)
        Natural earth crust materials (Rbe)
            Rocks (Rber)
                 Use For: Rock
                Coal (Rbers)
                    Anthracite (Rbersb)
                    Bituminous coal (Rbersd)
                    Lignite (Rbersm)
                         Use For: Brown coal; Earth coal
                    Subbituminous coal (Rberss)