Columbia subject headings:
Buchanan, James, 1791-1868.
China--Foreign relations--United States.
United States--Foreign relations--China.
United States--Politics and government--1857-1861.
Harvard subject headings:
China--Foreign relations--1644-1912
China--Foreign relations--United States.
United States--Foreign relations--1815-1861.
United States--Foreign relations--China.
Princeton subject headings: