Columbia subject headings:
Musical notation--Ukraine--Lʹviv.
Orthodox Eastern Church. Hirmologion. Church Slavic.
Harvard subject headings:
Musical notation--Ukraine--Lʹviv.
Orthodox Eastern Church. Hirmologion. Church Slavic.
Princeton subject headings:
Musical notation--Ukraine--Lʹviv.
Orthodox Eastern Church. Hirmologion. Church Slavic