Columbia subject headings:
Harvard subject headings:
Ekateringof (Saint Petersburg, Russia)--History.
Parks--Russia (Federation)--Saint Petersburg--History.
Saint Petersburg (Russia)--Buildings, structures, etc.
Saint Petersburg (Russia)--History
Saint Petersburg (Russia)--Social conditions.
Princeton subject headings:
Ekateringof (Saint Petersburg, Russia)
Palaces--Russia (Federation)--Saint Petersburg--History.
Parks--Russia (Federation)--Saint Petersburg--History.
Saint Petersburg (Russia)--Buildings, structures, etc.