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Excavations, mines and oil fields (Pdw)

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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)
        Excavations, mines and oil fields (Pdw)
            Excavations (Pdwe)
                 Use For: Cuts
            Mines (Pdwm)
            Oil fields (Pdwp)
        Embankments and retaining walls (Pdx)
        Bridges and culverts (Pdy)
             Related Term (Associative): Highway facilities (Pmr)