Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Mongolia.
Diplomats--China--Biography
Lin, Biao, 1908-1971.
Mongolia--Foreign relations--China.
Sun, Yixian.
Princeton subject headings:
China--Foreign relations--1949-1976.
China--Foreign relations--Mongolia.
Lin, Biao, 1908-1971--Death and burial.
Mongolia--Foreign relations--China.