Columbia subject headings:
Harvard subject headings:
15-M (Organization)
Protest movements--Spain--History--21st century.
Social movements--Spain--History--21st century.
Social movements--Spain.
Spain--Economic conditions--2008-
Spain--Politics and government--21st century.
Spain--Social life and customs--21st century.
Princeton subject headings:
Protest movements--Spain--History--21st century.
Social movements--Spain--History--21st century.
Spain--Economic conditions--21st century.
Spain--Politics and government--21st century.