Columbia subject headings:
Finland--Commerce--History--Congresses.
Industries--Finland--History--Congresses.
Industries--Soviet Union--History--Congresses.
Soviet Union--Commerce--History--Congresses.
Harvard subject headings:
Finland--Commerce--History--Congresses.
Industries--Finland--History--Congresses.
Industries--Soviet Union--History--Congresses.
Soviet Union--Commerce--History--Congresses.
Princeton subject headings:
Finland--Commerce--Congresses.
Industries--Finland--Congresses.
Industries--Soviet Union--Congresses.
Soviet Union--Commerce--Congresses.