Columbia subject headings:
Harvard subject headings:
Cuerpo de Ingenieros de Caminos, Canales y Puertos--History--18th century.
Spain--Politics and government--1833-1868.
Princeton subject headings:
Cuerpo de Ingenieros de Caminos, Canales y Puertos--History--18th century.
Spain--Politics and government--1833-1868.