Columbia subject headings:
Harvard subject headings:
Baltic States--Commerce--History--Congresses.
Cities and towns--Baltic States--History--Congresses.
City and town life--Baltic States--History--Congresses.
Hansa towns--Commerce--History--Congresses.
Princeton subject headings:
Baltic States--Economic conditions--Congresses.
Cities and towns--Baltic States--History--Congresses.
Cities and towns--Social aspects--Baltic States--Congresses.
Hansa towns--Commerce--History--Congresses.