Columbia subject headings:
Harvard subject headings:
United States--Social conditions--1865-1918--Congresses.
United States--Social conditions--1918-1932--Congresses.
United States--Social conditions--1933-1945--Congresses.
Princeton subject headings:
United States--Social conditions--1865-1918--Congresses.
United States--Social conditions--1918-1932--Congresses.
United States--Social conditions--1933-1945--Congresses.