Columbia subject headings:
Castilla y León (Spain)--Church history--Congresses.
Castilla y León (Spain)--History--Congresses.
Catholic Church--Spain--Castilla y León--Liturgy--Congresses.
Harvard subject headings:
Castilla y León (Spain)--Church history--Congresses.
Castilla y León (Spain)--History--Congresses.
Catholic Church--Liturgy--History--Middle Ages, 600-1500--Congresses.
Catholic Church--Spain--Castilla y León--Liturgy--Congresses.
Princeton subject headings:
Castilla y León (Spain)--Church history--Congresses.
Castilla y León (Spain)--History--Congresses.
Catholic Church--Spain--Castilla y León--Liturgy--Congresses.