Columbia subject headings:
Harvard subject headings:
Glass manufacture--Europe--Congresses.
Glass manufacture--Middle East--Congresses.
Glassware, Ancient--Europe--Congresses.
Glassware, Ancient--Middle East--Congresses.
Glassware, Roman--Congresses.
Princeton subject headings:
Glass manufacture--Europe--History--Congresses.
Glass manufacture--Middle East--History--Congresses.