Columbia subject headings:
Bishops--Northern Ireland--Biography.
Catholic Church--Bishops--Biography.
Crolly, William.
Harvard subject headings:
Catholic Church--Ireland--Bishops--Biography.
Crolly, William.
Ireland--Church history--19th century.
Princeton subject headings:
Catholic Church--Ireland--Bishops--Biography.
Crolly, William.
Ireland--Church history--19th century.