Columbia subject headings:
Architecture, Romanesque--Italy--Grado.
Art, Romanesque--Italy--Grado.
Basilica di San Piero a Grado--History.
Harvard subject headings:
Architecture, Romanesque--Italy--Grado.
Art, Romanesque--Italy--Grado.
Basilica di San Piero a Grado.
Grado (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Romanesque--Italy--Grado.
Art, Romanesque--Italy--Grado.
Basilica di San Piero a Grado.
Grado (Italy)--Buildings, structures, etc.