Columbia subject headings:
Holbach, Paul Henri Thiry, baron d', 1723-1789.
Marx, Karl, 1818-1883.
Harvard subject headings:
Holbach, Paul Henri Thiry, baron d', 1723-1789.
Marx, Karl, 1818-1883
Princeton subject headings:
Holbach, Paul Henry Thiry, baron d', 1723-1789.
Marx, Karl, 1818-1883.