Columbia subject headings:
Antarctica--Discovery and exploration--International cooperation.
Intelligence service--Soviet Union--History.
Soviet Union--Politics and government--1936-1953.
Harvard subject headings:
Antarctica--Discovery and exploration--International cooperation.
Intelligence service--Soviet Union--History.
Soviet Union--Politics and government--1936-1953.
Princeton subject headings:
Antarctica--Discovery and exploration--International cooperation.
Intelligence service--Soviet Union--History.
Soviet Union--Politics and government--1936-1953.