Columbia subject headings:
Church music--Spain--Huesca--500-1400.
Gregorian chants--Spain--Huesca--500-1400.
Music--Manuscripts--Spain--Huesca.
Processionals (Liturgical books)--Spain--Huesca.
Harvard subject headings:
Church music--Spain--Huesca--500-1400.
Gregorian chants--Spain--Huesca--500-1400.
Princeton subject headings: