Columbia subject headings:
País Vasco (Spain)--Politics and government--20th century.
País Vasco (Spain)--Social conditions.
Violence--Spain--País Vasco--History--20th century.
Harvard subject headings:
País Vasco (Spain)--Social conditions.
País Vasco (Spain)--Politics and government--20th century.
Violence--Spain--País Vasco--History--20th century.
Princeton subject headings:
País Vasco (Spain)--Social conditions.
Violence--Spain--País Vasco.