Columbia subject headings:
Business enterprises--Russia--History--19th century--Congresses.
Business enterprises--Russia--History--20th century--Congresses.
Royal households--Russia--History--19th century--Congresses.
Royal households--Russia--History--20th century--Congresses.
Russia--Court and courtiers--Social life and customs--19th century--Congresses.
Russia--Court and courtiers--Social life and customs--20th century--Congresses.
Harvard subject headings:
Business enterprises--Russia--History--19th century--Congresses.
Business enterprises--Russia--History--20th century--Congresses.
Royal households--Russia--History--19th century--Congresses.
Royal households--Russia--History--20th century--Congresses.
Russia--Court and courtiers--Social life and customs--19th century--Congresses.
Russia--Court and courtiers--Social life and customs--20th century--Congresses.
Princeton subject headings: