Columbia subject headings:
Economics--History--19th century.
Marx, Karl, 1818-1883.
Science--Philosophy--History--19th century.
Harvard subject headings:
Economics--History--19th century
Marx, Karl, 1818-1883
Science--Philosophy--History--19th century
Princeton subject headings:
Economics--History--19th century.
Marx, Karl, 1818-1883.
Science--Philosophy--History--19th century.