Columbia subject headings:
ETA (Organization)
Spain--Politics and government--1975-
Terrorism--Spain--History--20 century.
Terrorism--Spain--History--21st century.
Harvard subject headings:
Princeton subject headings:
ETA (Organization)
Terrorism--Government policy--Spain.
Terrorism--Political aspects--Spain.
Terrorism--Spain--Prevention--History--20th century.
Terrorism--Spain--Prevention--History--21st century.