Columbia subject headings:
Harvard subject headings:
Catholic Church--Byzantine rite, Ruthenian--Liturgy--History.
Catholic Church--Byzantine rite, Ruthenian--Ukraine--History--Sources.
Catholic Church. Liturgy of Saint John Chrysostom--History.
Princeton subject headings:
Catholic Church--Byzantine rite, Ruthenian--Liturgy--History.
Catholic Church--Byzantine rite, Ruthenian--Ukraine--History--Sources.
Catholic Church. Liturgy of Saint John Chrysostom--History.