Columbia subject headings:
Catholic Church. Pope (1878-1903 : Leo XIII). Aeterni Patris--Congresses.
Neo-Scholasticism--Congresses.
Thomists--Congresses.
Harvard subject headings:
Catholic Church. Pope (1878-1903 : Leo XIII). Aeterni Patris--Congresses.
Neo-Scholasticism--Congresses.
Thomists--Congresses.
Princeton subject headings:
Catholic Church. Pope (1878-1903 : Leo XIII). Aeterni Patris--Congresses.
Neo-Scholasticism--Congresses.
Thomists--Congresses.