Columbia subject headings:
Hoover, Herbert, 1874-1964.
United States--Politics and government--1929-1933.
Harvard subject headings:
Hoover, Herbert, 1874-1964.
United States--Politics and government--1929-1933.
Princeton subject headings:
Hoover, Herbert, 1874-1964.
United States--Politics and government--1929-1933.