Columbia subject headings:
Viticulture--Italy--Piedmont--History--Congresses.
Wine and wine making--Italy--Piedmont--History--Congresses.
Harvard subject headings:
Piemonte (Italy)--Economic conditions--Congresses.
Viticulture--Italy--Piedmont--History--Congresses.
Wine and wine making--Italy--Piedmont--History--Congresses.
Princeton subject headings:
Agriculture--Economic aspects--Italy--Piemonte--History--Congresses.
Viticulture--Italy--Piemonte--History--Congresses.
Wine and wine making--Italy--Piemonte--History--Congresses.
Wine industry--Italy--Piemonte--History--Congresses.