Columbia subject headings:
Harvard subject headings:
Europe, Eastern--Foreign relations--Europe, Western--Congresses.
Europe, Western--Foreign relations--Europe, Eastern--Congresses.
Mutualism--Europe, Eastern--Congresses.
Mutualism--Europe, Western--Congresses.
Mutualism--In literature--Congresses.
Princeton subject headings:
Community life in literature--Congresses.
European literature--20th century--History and criticism--Congresses.
Individuality in literature--Congresses.
Motion pictures--France--History--20th century--Congresses.