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 (Canon law)--Early works to 1800.
Liturgics--Early works to 1800.
Mass--Early works to 1800.
Harvard subject headings:
Catholic Church--Clergy--Early works to 1800.
Catholic Church--Liturgy--Early works to 1800.
Catholic Church--Liturgy--History--Middle Ages, 600-1500--Sources.
Catholic Church--Liturgy--History--Middle Ages, 600-1500.
Church year--Early works to 1800.
Divine office (Canon law)--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 (Canon law)--Early works to 1800.
Liturgics--Early works to 1800.
Mass--Early works to 1800.