Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Soviet Union.
China--History--Warlord period, 1916-1928.
Feng, Yuxiang, 1882-1948
Soviet Union--Foreign relations--China.
Princeton subject headings:
China--Foreign relations--Soviet Union.
China--History--Warlord period, 1916-1928.
Feng, Yuxiang, 1882-1948.
Soviet Union--Foreign relations--China.