Columbia subject headings:
Harvard subject headings:
Engelberg, Ernst.
Europe--Politics and government--1789-1900.
Germany--History--1789-1900.
Historians--Germany--Biography
Nationalism--Europe--History--19th century.
Socialism--Europe--19th century.
Princeton subject headings:
Engelberg, Ernst.
Europe--Politics and government--1789-1900.
Historians--Germany--Biography.
Nationalism--Europe--History--19th century.
Socialism--Europe--History--19th century.