Columbia subject headings:
Harvard subject headings:
China--History--Warlord period, 1916-1928.
Communism--China--History
Communism--Soviet Union--History
Stalin, Joseph, 1878-1953
Trotsky, Leon, 1879-1940
Princeton subject headings:
China--History--Warlord period, 1916-1928.
Communism--China--History.
Communism--Soviet Union--History.
Stalin, Joseph, 1878-1953.
Trotsky, Leon, 1879-1940.