Columbia subject headings:
Spanish language--Congresses.
Spanish language--Spain--Aragon--Congresses.
Spanish literature--History and criticism--Congresses.
Spanish literature--Spain--Aragon--History and criticism--Congresses.
Harvard subject headings:
Aragonese language--Congresses.
Spanish language--Congresses.
Spanish language--Spain--Aragon--Congresses.
Spanish literature--History and criticism--Congresses.
Spanish literature--Spain--Aragon--History and criticism--Congresses.
Princeton subject headings:
Spanish language--Spain--Aragon--History--Congresses.
Spanish literature--Spain--Aragon--History and criticism--Congresses.