Columbia subject headings:
Harvard subject headings:
Cities and towns, Medieval--Kievan Rus--Congresses.
Cities and towns, Medieval--Russia--Congresses.
Cities and towns--Russia--Congresses.
Princeton subject headings:
Cities and towns--Kievan Rus--History--Congresses.
Cities and towns--Russia--History--Congresses.
Kievan Rus--Social conditions--Congresses.
Russia--Social conditions--Congresses.