Columbia subject headings:
Bauer, Bruno, 1809-1882.
Marx, Karl, 1818-1883.
Philosophy, German--19th century.
Ruge, Arnold, 1802-1880.
Harvard subject headings:
Bauer, Bruno, 1809-1882.
Marx, Karl, 1818-1883
Philosophy, German--19th century.
Ruge, Arnold, 1802-1880.
Princeton subject headings:
Bauer, Bruno, 1809-1882.
Marx, Karl, 1818-1883.
Philosophy, German--19th century.
Ruge, Arnold, 1802-1880.