Columbia subject headings:
Azione cattolica italiana--History--Congresses.
Catholic Action--Italy--History--20th century--Congresses.
Catholics--Political activity--Italy--History--20th century--Congresses.
Harvard subject headings:
Azione cattolica italiana--History--Congresses.
Catholic Action--Italy--History--20th century--Congresses.
Catholics--Political activity--Italy--History--20th century--Congresses.
Princeton subject headings: