Columbia subject headings:
Harvard subject headings:
Bernays family.
Bernays, Karl Ludwig, 1815-1876.
Intellectuals--Germany--Biography.
Princeton subject headings:
Bernays, Karl Ludwig, 1815-1876--Friends and associates.
Bernays, Karl Ludwig, 1815-1876.
Lawyers--Germany--Biography.
Marx, Karl, 1818-1883--Friends and associates.