Columbia subject headings:
Architecture, Byzantine--Italy--Ravenna.
Building materials--Recycling--Italy--Ravenna--History.
Church architecture--Italy--Ravenna.
Harvard subject headings:
Architecture, Byzantine--Italy--Ravenna.
Architecture, Early Christian--Italy--Ravenna.
Building materials--Recycling--Italy--Ravenna--History--To 1500.
Church architecture--Italy--Ravenna.
Decoration and ornament, Architectural--Italy--Ravenna--History--To 1500.
Decoration and ornament, Architectural--Italy--Ravenna--To 1500.
Ravenna (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Early Christian--Italy--Ravenna.
Building materials--Recycling--Italy--Ravenna--History--To 1500.
Decoration and ornament, Architectural--Italy--Ravenna--History--To 1500.
Ravenna (Italy)--Buildings, structures, etc.