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Observation wells (Pdwpk)

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Facilities (P)
     Use For: Complexes; Installations
    Specialized facilities (Pd)
        Excavations, mines and oil fields (Pdw)
            Oil fields (Pdwp)
                Observation wells (Pdwpk)
                Oil pools (Pdwpp)
                     Use For: Oil reservoirs
                Oil wells (Pdwpw)