Columbia subject headings:
Comparative government.
Mexico--Politics and government--1910-1946.
Revolutions.
Soviet Union--Politics and government.
Harvard subject headings:
Comparative government.
Mexico--Politics and government--1910-1946.
Revolutions
Soviet Union--Politics and government--1917-1936.
Soviet Union--Politics and government.
Princeton subject headings:
Comparative government.
Mexico--Politics and government--1910-1946.
Revolutions.
Soviet Union--Politics and government.