Columbia subject headings:
Leroux, Pierre, 1797-1871.
Socialism--Europe--History--19th century.
Socialists--Europe--History--19th century.
Harvard subject headings:
Leroux, Pierre, 1797-1871.
Socialism--Europe--19th century.
Socialism--Europe--History--19th century.
Socialists--Europe--History--19th century.
Princeton subject headings:
Leroux, Pierre, 1797-1871.
Socialism--Europe.
Socialists--France--Biography.