Columbia subject headings:
Industrial relations--China--Hong Kong--Congresses.
Labor movement--China--Hong Kong--Congresses.
Labor unions--China--Hong Kong--Congresses.
Harvard subject headings:
Industrial relations--China--Hong Kong--Congresses.
Labor movement--China--Hong Kong--Congresses.
Labor unions--China--Hong Kong--Congresses.
Syndicalism--China--Hong Kong--Congresses.
Princeton subject headings: