Columbia subject headings:
Elections--Spain--History--21st century.
Spain--Politics and government--21st century.
Voting--Spain--History--21st century.
Harvard subject headings:
Elections--Spain--History--21st century.
Spain--Politics and government--21st century.
Voting--Spain--History--21st century.
Princeton subject headings:
Elections--Spain--History--21st century.
Spain--Politics and government--21st century.
Voting--Spain--History--21st century.