Columbia subject headings:
Harvard subject headings:
Food supply--Congresses
Malthus, T. R. (Thomas Robert), 1766-1834--Congresses.
Malthusianism--Congresses.
Population--Congresses
Princeton subject headings:
Demographic transition--Congresses.
Famines--Congresses.
Food relief--Congresses.
Food supply--Congresses.
Malthusianism--Congresses.