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Fresh water (Rbdmf)

Computer viruses ()
Materials (R)
    Classes of materials (Rb)
        Water (Rbd)
            Water by salt content (Rbdm)
                Fresh water (Rbdmf)
                    Drinking water (Rbdmfd)
                         Use For: Potable water
                Seawater (Rbdms)
                     Use For: Ocean water; Saline water; Salt water; Sea water