Columbia subject headings:
Malthus, T. R. (Thomas Robert), 1766-1834--Congresses.
Harvard subject headings:
Europe--Economic conditions--1789-1900.
Malthus, T. R. (Thomas Robert), 1766-1834--Congresses.
Princeton subject headings:
Malthus, T. R. (Thomas Robert), 1766-1834--Congresses.