Columbia subject headings:
Harvard subject headings:
Capitalism--Europe--History--19th century.
Economists--Germany--Biography
Engels, Friedrich, 1820-1895
Europe--Economic conditions--19th century
Princeton subject headings:
Capitalism--Europe--History--19th century.
Engels, Friedrich, 1820-1895--Biography.
Europe--Economic conditions--1789-1900.
Europe--Economic conditions--19th century.