Columbia subject headings:
United States--Civilization--1918-1945.
United States--Intellectual life--20th century.
Harvard subject headings:
Radicalism--United States.
United States--Civilization--1918-1945.
United States--Intellectual life--20th century.
Princeton subject headings:
United States--Civilization--1918-1945.
United States--Intellectual life--20th century.