Columbia subject headings:
Guangdong Sheng (China)--History--20th century--Sources.
Labor movement--China--Guangdong Sheng--History--Sources.
Harvard subject headings:
Guangdong Sheng (China)--History--20th century--Sources.
Labor movement--China--Guangdong Sheng--History--Sources.
Princeton subject headings:
Guangdong Sheng (China)--History--20th century--Sources.
Labor movement--China--Guangdong Sheng--History--Sources.