Columbia subject headings:
Industries--China--Tianjin--History.
Women--Employment--China--Tienstsin--History.
Harvard subject headings:
Industries--China--Tianjin--History.
Labor unions--China--Tianjin--History.
Tianjin (China)--History.
Women--Employment--China--Tianjin--History.
Working class--China--Tianjin--History.
Princeton subject headings:
Industries--China--Tientsin--History.
Women--Employment--China--Tientsin--History.