Columbia subject headings:
Catholic Church--Clergy--Early works to 1800.
Catholic Church--Liturgy--Early works to 1800.
Church year--Early works to 1800.
Divine office--Early works to 1800.
Mass--Early works to 1800.
Harvard subject headings:
Art, Medieval.
Catholic Church--Clergy--Early works to 1800.
Catholic Church--Liturgy--Early works to 1800.
Catholic Church--Liturgy--History--Middle Ages, 600-1500.
Catholic Church--Liturgy--History--Sources.
Christian art and symbolism
Church architecture.
Church year--Early works to 1800.
Divine Office--Early works to 1800.
Liturgics--Early works to 1800.
Mass--Early works to 1800
Princeton subject headings:
Catholic Church--Clergy--Early works to 1800.
Catholic Church--Liturgy--Early works to 1800.
Church year--Early works to 1800.
Divine office--Early works to 1800.
Mass--Early works to 1800.