Columbia subject headings:
Aragon (Spain)--History--Congresses.
Jaca (Spain)--History--Congresses.
Harvard subject headings:
Aragon (Spain)--History--Congresses.
Jaca (Spain)--History--Congresses.
Princeton subject headings:
Aragon (Spain)--History--Congresses.
Jaca (Spain)--History--Congresses.