Columbia subject headings:
Harvard subject headings:
Spanish language--Dialects--Spain--Aragon--Congresses.
Spanish language--Dialects--Spain--Aragon.
Spanish language--To 1500--Congresses.
Spanish literature--Spain--Aragon--Congresses.
Spanish literature--Spain--Aragon--History and criticism.
Spanish literature--To 1500--History and criticism
Princeton subject headings:
Spanish literature--To 1500--Congresses.
Spanish philology--Congresses.