Columbia subject headings:
Harvard subject headings:
Architecture, Medieval--Italy--Tuscany--Congresses.
Church architecture--Italy--Tuscany--Congresses.
Crypts--Italy--Tuscany--Congresses.
Princeton subject headings:
Architecture, Medieval--Italy--Tuscany--Congresses.
Church architecture--Italy--Tuscany--Congresses.
Crypts--Italy--Tuscany--Congresses.