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Underground structures (Pdv)

Facilities (P)
     Use For: Complexes; Installations
    Specialized facilities (Pd)
        Construction sites (Pdc)
             Use For: Construction zones
        Underground structures (Pdv)
             Use For: Subsurface structures; Underground facilities
             Related Term (Associative): Pipelines (Pmnp); Underground utility lines (Pmptmu); Highway facilities (Pmr)
            Underground parking garages (Pdvp)
            Tunnels (Pdvt)
                 Related Term (Associative): 
            Wells (Pdvw)
        Excavations, mines and oil fields (Pdw)
        Embankments and retaining walls (Pdx)
        Bridges and culverts (Pdy)
             Related Term (Associative): Highway facilities (Pmr)