Columbia subject headings:
Harvard subject headings:
Mosaics--Congresses.
Mosaics--Conservation and restoration--Congresses.
Pavements, Mosaic--Congresses.
Pavements, Mosaic--Conservation and restoration--Congresses.
Princeton subject headings:
Mosaics--Congresses.
Mosaics--Conservation and restoration--Congresses.
Pavements, Mosaic--Congresses.
Pavements, Mosaic--Conservation and restoration--Congresses.