Columbia subject headings:
Architecture--Details.
Building materials--Recycling--Italy--Ravenna.
Church architecture--Italy--Ravenna.
Harvard subject headings:
Architecture, Medieval--Italy--Ravenna.
Building materials--Recycling--Italy--Ravenna--History--To 1500.
Church architecture--Italy--Ravenna.
Decoration and ornament, Architectural--Italy--Ravenna--To 1500.
Princeton subject headings:
Architecture, Medieval--Italy--Ravenna.
Architecture--Italy--Ravenna--Details.
Building materials--Recycling--Italy--Ravenna--History--To 1500.
Church architecture--Italy--Ravenna.