Columbia subject headings:
Alps, Italian (Italy)--Antiquities--Congresses.
Alps, Italian (Italy)--History--Congresses.
Alps--Antiquities--Congresses.
Alps--History--Congresses.
Po River Valley (Italy)--Antiquities--Congresses.
Po River Valley (Italy)--History--Congresses.
Harvard subject headings:
Alps, Italian (Italy)--Antiquities--Congresses.
Alps, Italian (Italy)--History--Congresses.
Alps--Antiquities--Congresses.
Alps--History--Congresses.
Po River Valley (Italy)--Antiquities--Congresses.
Po River Valley (Italy)--History--Congresses.
Princeton subject headings:
Alps Region--Antiquities--Congresses.
Alps Region--History--Congresses.
Italy, Northern--Antiquities--Congresses.