Columbia subject headings:
Agriculture--Economic aspects--Congresses.
Food supply--Mediterranean Region--Congresses.
Mediterranean Region--Population--Congresses.
Harvard subject headings:
Agriculture--Mediterranean Region--Congresses.
Food supply--Mediterranean Region--Congresses.
Mediterranean Region--Economic aspects--Congresses.
Mediterranean Region--Population--Congresses.
Princeton subject headings:
Agriculture--Economic aspects--Congresses.
Food supply--Mediterranean Region--Congresses.
Mediterranean Region--Population--Congresses.