Columbia subject headings:
Harvard subject headings:
Ivories, Byzantine--Catalogs.
Ivories, Byzantine--Italy--Ravenna--Catalogs.
Ivories, Medieval--Catalogs.
Ivories, Medieval--Italy--Ravenna--Catalogs.
Ivories--Italy--Ravenna--Catalogs.
Ivory carving--Italy--Ravenna--Catalogs.
Museo nazionale di Ravenna--Catalogs.
Princeton subject headings:
Ivories, Byzantine--Italy--Ravenna--Catalogs.
Ivories, Medieval--Italy--Ravenna--Catalogs.
Museo nazionale di Ravenna--Catalogs.