Columbia subject headings:
Mayors--Spain--País Vasco.
País Vasco (Spain)--Politics and government--20th century.
Socialism--Spain--País Vasco--History--20th century.
Socialism--Spain--País Vasco--History--21st century.
Harvard subject headings:
Mayors--Spain--País Vasco--History.
Municipal government--Spain--País Vasco--History.
Socialists--Spain--País Vasco--History.
Princeton subject headings:
Mayors--Spain--País Vasco--History.
Municipal government--Spain--País Vasco--History.
Socialists--Spain--País Vasco--History.