Columbia subject headings:
Excavations (Archaeology)--Italy--Spoleto--Congresses.
Rocca (Spoleto, Italy)--Congresses.
Spoleto (Italy)--Antiquities--Congresses.
Harvard subject headings:
Architecture, Medieval--Conservation and restoration--Italy--Spoleto--Congresses.
Excavations (Archaeology)--Italy--Spoleto--Congresses.
Rocca (Spoleto, Italy)
Spoleto (Italy)--Buildings, structures, etc.--Congresses.
Princeton subject headings:
Architecture, Medieval--Conservation and restoration--Italy--Spoleto--Congresses.
Excavations (Archaeology)--Italy--Spoleto--Congresses.
Rocca (Spoleto, Italy)
Spoleto (Italy)--Buildings, structures, etc.--Congresses.