Columbia subject headings:
Harvard subject headings:
China--Foreign relations--Soviet Union--Chronology.
Heilongjiang Sheng (China)--History--Chronology.
Soviet Union--Foreign relations--China--Chronology.
Princeton subject headings:
China--Foreign relations--Soviet Union--Chronology.
Heilongjiang Sheng (China)--History--Chronology.
Soviet Union--Foreign relations--China--Chronology.