Source: PL-WRu I F 414 Cistercian Gradual (Silesia)Folio: 007rSequence: 2Feast: Nativitas DominiOffice: MASSGenre: OffCantus ID: g00545Mode: 4Full text: Laetentur caeli et exsultet terra ante faciem domini quoniam venitNotes: Missa in nocte