Source: Praha, Knihovna Národního muzea, ms. XIII B 9Siglum: CZ-Pn XIII B 9Folios: 353r-353vFolio: 353rFull text (or incipit): Natus ante seculaGenre: SqRubrics: ItemFeast: Nativitas DominiCantus ID: ah53015Form: T
