Columbia subject headings:
Harvard subject headings:
Malthus, T. R. (Thomas Robert), 1766-1834. Essay on the principle of population.
Say, Jean Baptiste, 1767-1832. Traité d'économie politique.
Princeton subject headings:
Economics.
Malthus, T. R. (Thomas Robert), 1766-1834. An essay on the principle of population.
Population.
Say, Jean Baptiste, 1767-1832. Traité d'économie politique.