Columbia subject headings:
Spain--History--1868-1931.
Spain--Politics and government--1886-1931.
Spain--Social conditions--1886-1939.
Harvard subject headings:
Spain--Politics and government--1886-1931.
Princeton subject headings:
Spain--History--1868-1931.
Spain--Politics and government--1886-1931.
Spain--Social conditions--1886-1939.