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Classes of materials (Rb)

Materials (R)
    Classes of materials (Rb)
        States of matter (Rbb)
        Chemicals (Rbc)
             Related Term (Associative): 
        Water (Rbd)
        Natural earth crust materials (Rbe)
        Fuels (Rbf)
        Air (Rbj)
        Building materials (Rbm)
             Use For: Construction materials
             Related Term (Associative): Equipment (Qt)
    Properties of materials (Rk)
         Use For: Engineering properties