Columbia subject headings:
Baptism--History--Early church, ca. 30-600.
Catholic Church--Liturgy--Early church, ca. 30-600.
Catholic Church--Liturgy--History--Sources.
Liturgies, Early Christian--Texts--Translations into English.
Lord's Supper--History--Early church, ca. 30-600.
Harvard subject headings:
Baptism--History--Early church, ca. 30-600
Catholic Church--Liturgy--History.
Liturgies, Early Christian.
Princeton subject headings: