Columbia subject headings:
United States--Foreign relations--1921-1923.
United States--Foreign relations--1923-1929.
United States--Foreign relations--1929-1933.
Harvard subject headings:
United States--Foreign relations--1921-1923.
United States--Foreign relations--1923-1929.
United States--Foreign relations--1929-1933.
Princeton subject headings:
United States--Foreign relations--1921-1923.
United States--Foreign relations--1923-1929.
United States--Foreign relations--1929-1933.