Columbia subject headings:
Euzkadi (Spain)--History.
Nationalism--Spain--País Vasco--History--20th century.
País Vasco (Spain)--History--Autonomy and independence movements.
Harvard subject headings:
ETA (Organization)--History--20th century.
Euzkadi (Spain)--History.
Nationalism--Spain--País Vasco--History--20th century
País Vasco (Spain)--History--Autonomy and independence movements.
Princeton subject headings: