Columbia subject headings:
Excavations (Archaeology)--Russia (Federation)--Petrokrepostʹ.
Petrokrepostʹ (R.S.F.S.R.)--History.
Russia (Federation)--Antiquities.
Harvard subject headings:
Excavations (Archaeology)--Russia (Federation)--Petrokrepostʹ.
Petrokrepost',--History.
Petrokrepostʹ (R.S.F.S.R.)--History.
Russia (Federation)--Antiquities.
Princeton subject headings:
Petrokrepostʹ (R.S.F.S.R.)--History.