Columbia subject headings:
Harvard subject headings:
Benedict XV, Pope, 1854-1922--Congresses.
Benedict XV, Pope, 1854-1922. Dès le début--Congresses.
Peace--Religious aspects--Christianity--Congresses
World War, 1914-1918--Peace--Congresses.
Princeton subject headings:
Benedict XV, Pope, 1854-1922--Congresses.
Catholic Church. Pope (1914-1922 : Benedict XV). Dès le début
Conference papers and proceedings.
World War, 1914-1918--Peace--Congresses.
World War, 1914-1918--Religious aspects--Catholic Church--Congresses.