Columbia subject headings:
England--Intellectual life.
France--Intellectual life.
Italy--Intellectual life.
Positivism--History.
Harvard subject headings:
England--Intellectual life.
France--Intellectual life.
Italy--Intellectual life.
Positivism--History.
Princeton subject headings:
England--Intellectual life.
France--Intellectual life.
Italy--Intellectual life.
Positivism--History.