Columbia subject headings:
Harvard subject headings:
Communism--Mongolia--History.
Communist International--History.
Mongolia--History--20th century.
Princeton subject headings:
Communism--Mongolia--History.
Communist International--History.
Mongolia--Foreign relations--Soviet Union--Sources.
Mongolia--History--20th century.
Mongolia--History--Revolution, 1921.
Mongolia--Politics and government--History--20th century.
Soviet Union--Foreign relations--Mongolia--Sources.