Columbia subject headings:
Harvard subject headings:
Europe--Social conditions--1789-1900.
Industries--Europe--History--19th century.
Industries--United States--History--19th century.
Technological innovations--Europe--History--19th century.
Technological innovations--United States--History--19th century.
United States--Social conditions--1865-1918.
United States--Social conditions--To 1865.
United States--Social conditions.
Princeton subject headings:
Europe--Social conditions--1789-1900.
Industries--Europe--History--19th century.
Industries--United States--History--19th century.
Technological innovations--Europe--History--19th century.
Technological innovations--United States--History--19th century.
United States--Social conditions.