Columbia subject headings:
Argentina--History--1910-1943.
Soviet Union--History--Revolution, 1917-1921--Influence.
Harvard subject headings:
Argentina--History--1910-1943.
Soviet Union--History--Revolution, 1917-1921--Influence.
Princeton subject headings:
Argentina--History--1910-1943.
Soviet Union--History--Revolution, 1917-1921--Influence.