Columbia subject headings:
Spain--History--1868-1931.
Spain--History--20th century.
Spain--Politics and government--19th century.
Spain--Politics and government--20th century.
Harvard subject headings:
Spain--Politics and government--1886-1931.
Spain--Politics and government--1931-1939.
Princeton subject headings:
Spain--History--1868-1931.
Spain--History--20th century.
Spain--Politics and government--19th century.
Spain--Politics and government--20th century.