Columbia subject headings:
Asia--Social conditions--Congresses.
Oceania--Social conditions--Congresses.
Working class--Asia--Congresses.
Working class--Oceania--Congresses.
Harvard subject headings:
Asia--Social conditions--Congresses.
Labor--Asia--Congresses.
Labor--Oceania--Congresses.
Oceania--Social conditions--Congresses.
Working class--Asia--Congresses.
Working class--Oceania--Congresses.
Princeton subject headings: