Columbia subject headings:
Russia--Foreign relations--1894-1917.
Soviet Union--Foreign relations--1917-1945.
World politics.
Harvard subject headings:
Russia--Foreign relations--1894-1917.
Soviet Union--Foreign relations--1917-1945.
World politics
Princeton subject headings:
Russia--Foreign relations--1894-1917.
Soviet Union--Foreign relations--1917-1945.
World politics.