Columbia subject headings:
Harvard subject headings:
Holbach, Paul Henri Thiry, baron d', 1723-1789. Système de la nature.
Materialism--Early works to 1800.
Philosophy and religion--Early works to 1800.
Psychology--Early works to 1850
Princeton subject headings:
Holbach, Paul Henri Thiry, baron d', 1723-1789. Systême de la nature.