Columbia subject headings:
Architecture, Early Christian--Italy--Rome.
Church buildings--Italy--Rome.
Rome (Italy)--Buildings, structures, etc.
Harvard subject headings:
Architecture, Early Christian--Italy--Rome.
Christianity--Rome.
Church buildings--Italy--Rome--History.
Rome (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Early Christian--Rome.
Christianity--Rome.
Church buildings--Italy--Rome--History.
Rome (Italy)--Buildings, structures, etc.