Columbia subject headings:
Harvard subject headings:
Cities and towns--Spain--Navarre--History--20th century.
Navarre (Spain)--Politics and government--20th century.
Navarre (Spain)--Politics and government.
Socialism--Spain--Navarre--History--20th century.
Socialism--Spain--Navarre--History.
Unión General de Trabajadores de España--History--20th century.
Princeton subject headings:
Navarre (Spain)--Politics and government.
Socialism--Spain--Navarre--History.