Columbia subject headings:
Orthodox Eastern Church. Triodion.
Harvard subject headings:
Lent--Liturgy--Texts--History and criticism.
Orthodox Eastern Church--Liturgy--Texts--History and criticism.
Orthodox Eastern Church. Triodion.
Princeton subject headings:
Lent--Liturgy--Texts--History and criticism.
Orthodox Eastern Church--Liturgy--Texts--History and criticism.
Orthodox Eastern Church. Triodion.