Columbia subject headings:
Apses (Architecture)--Italy--Lombardy.
Architecture, Medieval--Italy--Lombardy.
Cathedrals--Italy--Lombardy.
Church architecture--Italy--Lombardy.
Harvard subject headings:
Apses (Architecture)--Italy--Lombardy.
Architecture, Medieval--Italy--Lombardy.
Cathedrals--Italy--Lombardy.
Church architecture--Italy--Lombardy.
Princeton subject headings:
Cathedrals--Italy--Lombardy.
Church architecture--Italy--Lombardy.