Columbia subject headings:
Harvard subject headings:
Haugen, Gilbert Nelson, 1859-1933--Congresses.
Hoover, Herbert, 1874-1964--Congresses.
Progressivism (United States politics)--Congresses.
United States--Politics and government--20th century--Congresses.
Wallace, Henry A. (Henry Agard), 1888-1965--Congresses.
Princeton subject headings:
Haugen, Gilbert Nelson, 1859-1933--Congresses.
Hoover, Herbert, 1874-1964--Congresses.
Progressivism (United States politics)--Congresses.
United States--Politics and government--20th century--Congresses.
Wallace, Henry A. (Henry Agard), 1888-1965--Congresses.