Columbia subject headings:
Harvard subject headings:
China--Foreign economic relations--China--Hong Kong.
China--Foreign economic relations--China--Macau (Special Administrative Region)
Hong Kong (China)--Foreign economic relations--China.
Macau (China : Special Administrative Region)--Foreign economic relations--China.
Pearl River Delta (China)
Princeton subject headings:
China--Foreign economic relations--Hong Kong.
China--Foreign economic relations--Macao.
Hong Kong--Foreign economic relations--China.
Macau--Foreign economic relations--China.
Pearl River Delta (China)