Columbia subject headings:
Catholic Church--Italy--Liturgy--Texts--Manuscripts--Union lists.
Catholic Church--Liturgy--Texts--Manuscripts--Union lists.
Gregorian chants--Manuscripts--Union lists.
Manuscripts, Latin (Medieval and modern)--Union lists.
Service books (Music)--Catholic Church--Manuscripts--Union lists.
Harvard subject headings:
Catholic Church--Italy--Liturgy--Texts--Manuscripts--Union lists.
Catholic Church--Liturgy--Texts--Manuscripts--Union lists.
Gregorian chants--Manuscripts--Union lists.
Manuscripts, Latin (Medieval and modern)--Union lists.
Service books (Music)--Catholic Church--Manuscripts--Union lists.
Princeton subject headings:
Catalogs.
Liturgies--Italy--Catalogs.