Columbia subject headings:
Stone industry and trade--Istria (Croatia and Slovenia)--Congresses.
Stone industry and trade--Italy--Venice--History--Congresses.
Harvard subject headings:
Architecture--Details--Congresses.
Architecture--Italy--Venice--Congresses.
Building materials--Italy--Venice--History--Congresses.
Building stones--Istria (Croatia and Slovenia)--History--Congresses.
Princeton subject headings:
Stone industry and trade--Istria (Croatia and Slovenia)--Congresses.
Stone industry and trade--Italy--Venice--History--Congresses.