Columbia subject headings:
Harvard subject headings:
Armenia--Church history.
Armenian Church--History.
Armenian question
Bulls, Papal--History--19th century.
Catholic Church--Relations--Armenian church.
Catholic Church. Pope (1846-1878 : Pius IX)
Schism--History--19th century.
Princeton subject headings:
Bulls, Papal.
Catholic Church--Armenia--History.
Pius IX, Pope, 1792-1878.
Schism.