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