Columbia subject headings:
Malthus, T. R. (Thomas Robert), 1766-1834.
Malthusianism.
Mill, John Stuart, 1806-1873.
Population.
Harvard subject headings:
Malthus, T. R. (Thomas Robert), 1766-1834.
Malthusianism.
Mill, John Stuart, 1806-1873
Population
Princeton subject headings: