Columbia subject headings:
China--Emigration and immigration--History.
China--Foreign economic relations--United States--History.
United States--Emigration and immigration--History.
United States--Foreign economic relations--China--History.
Harvard subject headings:
China--Emigration and immigration--History.
China--Foreign economic relations--United States--History.
United States--Emigration and immigration--History.
United States--Foreign economic relations--China.
Princeton subject headings:
China--Foreign relations--United States.
Chinese Americans--History.
Navigation--United States--History.
Opium trade--United States--History.
United States--Emigration and immigration.
United States--Foreign relations--China.