Columbia subject headings:
Harvard subject headings:
Lingao Xian (China)--History.
Mei Xian (Guangdong Sheng, China)--History.
Wengyuan Xian (Guangdong Sheng, China)--History.
Yangchun Xian (China)--History.
Princeton subject headings:
Lin'gao Xian (China)--History,
Mei Xian (Guangdong Sheng, China)--History.
Wengyuan Xian (Guangdong Sheng, China)--History.
Yangchun Xian (China)--History.