Columbia subject headings:
Agriculture--Economic aspects--History--Middle Ages, 600-1500--Congresses.
Cities and towns, Medieval--Congresses.
Economic history--Medieval, 500-1500--Congresses.
Urban economics--History--Congresses.
Harvard subject headings:
Agriculture--Economic aspects--History--Middle Ages, 600-1500--Congresses.
Cities and towns, Medieval--Congresses
Economic history--Medieval, 500-1500--Congresses.
Urban economics--History--Congresses.
Princeton subject headings: