Columbia subject headings:
Biblioteca apostolica vaticana--Catalogs.
Catholic Church--Liturgy--Bibliography.
Catholic Church--Liturgy--Texts--Manuscripts--Catalogs.
Liturgies--Bibliography.
Manuscripts, Latin (Medieval and modern)--Vatican City--Catalogs.
Manuscripts--Vatican City--Catalogs.
Harvard subject headings:
Catholic Church--Liturgy--Bibliography.
Liturgies--Bibliography.
Manuscripts--Italy--Catalogs
Princeton subject headings: