Columbia subject headings:
Soviet Union--Foreign relations--Vietnam--Sources.
Soviet Union--History--1925-1953--Sources.
Vietnam--Foreign relations--Soviet Union--Sources.
Vietnam--History--1945-1975--Sources.
Harvard subject headings:
Soviet Union--Foreign relations--Vietnam--Sources.
Soviet Union--History--1925-1953--Sources.
Vietnam--Foreign relations--Soviet Union--Sources.
Vietnam--History--1945-1975--Sources.
Princeton subject headings: