Columbia subject headings:
Lassalle, Ferdinand, 1825-1864.
Marx, Karl, 1818-1883.
Working class--Austria--History.
Harvard subject headings:
Labor movement--Austria--History--19th century.
Lassalle, Ferdinand, 1825-1864.
Marx, Karl, 1818-1883
Princeton subject headings:
Labor movement--Austria--History--19th century.
Lassalle, Ferdinand, 1825-1864.
Marx, Karl, 1818-1883.