Columbia subject headings:
Bone carving--Catalogs.
Bone carving--Italy--Ravenna--Catalogs.
Ivories--Catalogs.
Ivories--Italy--Ravenna--Catalogs.
Museo nazionale di Ravenna--Catalogs.
Harvard subject headings:
Bone carving--Catalogs.
Bone carving--Italy--Ravenna--Catalogs.
Ivories--Catalogs.
Ivories--Italy--Ravenna--Catalogs.
Museo nazionale di Ravenna--Catalogs.
Princeton subject headings:
Bone carving--Italy--Ravenna--Catalogs.
Catalogs.
Ivories--Italy--Ravenna--Catalogs.
Museo nazionale di Ravenna--Catalogs.