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