Columbia subject headings:
Harvard subject headings:
Economics--History--19th century--Quotations, maxims, etc.
Economics--History--To 1800--Quotations, maxims, etc.
Engels, Friedrich, 1820-1895--Quotations.
Marx, Karl, 1818-1883--Quotations.
Princeton subject headings:
Economics--History--19th century.
Economics--History--To 1800.
Engels, Friedrich, 1820-1895.
Marx, Karl, 1818-1883.