Columbia subject headings:
Spain--History--19th century.
Spain--History--20th century.
Spain--Politics and government--19th century.
Spain--Politics and government--20th century.
Harvard subject headings:
Civil-military relations--Spain.
Spain--Politics and government--19th century.
Spain--Politics and government--20th century.
Spain. Cuerpo de la Guardia Civil--History.
Princeton subject headings:
Spain--History--19th century.
Spain--History--20th century.
Spain--Politics and government--19th century.
Spain--Politics and government--20th century.