Columbia subject headings:
Harvard subject headings:
Europe--Intellectual life--19th century.
Regression (Civilization)
United States--Intellectual life--1783-1865.
United States--Intellectual life--1865-1918.
Princeton subject headings:
Europe--Intellectual life--19th century.
Regression (Civilization)
United States--Intellectual life--1783-1865.
United States--Intellectual life--1865-1918.