Columbia subject headings:
Harvard subject headings:
Demography--Great Britain--History--18th century.
Demography--Great Britain--History--19th century.
Great Britain--Population.
Malthus, T. R. (Thomas Robert), 1766-1834.
Ricardo, David, 1772-1823.
Princeton subject headings:
Demography--Great Britain--History--18th century.
Demography--Great Britain--History--19th century.
Great Britain--Population.
Malthus, T. R. (Thomas Robert), 1766-1834.
Ricardo, David, 1772-1823.