Columbia subject headings:
Harbors--China--Yunnan Sheng--History.
Yunnan Sheng (China)--Commerce.
Yunnan Sheng (China)--Economic conditions--19th century.
Yunnan Sheng (China)--Economic conditions--20th century.
Harvard subject headings:
Harbors--China--Yunnan Sheng--History.
Yunnan Sheng (China)--Commerce.
Yunnan Sheng (China)--Economic conditions--19th century.
Yunnan Sheng (China)--Economic conditions--20th century.
Princeton subject headings: