Columbia subject headings:
Harvard subject headings:
Badia greca di Grottaferrata di Maria Santissima.
Grottaferrata (Italy)--Church history.
Roma e l'Oriente.
Princeton subject headings:
Badia greca di Grottaferrata di Maria Santissima--History.
Catholic Church--Oriental rites--History.
Catholic Church--Relations--Orthodox Eastern Church--History--Sources.
Catholic Church--Relations--Orthodox Eastern Church--History.
Order of St. Basil the Great--History.
Orthodox Eastern Church--Relations--Catholic Church--History--Sources.
Orthodox Eastern Church--Relations--Catholic Church--History.
Roma e l'Oriente.