Columbia subject headings:
P.S.O.E. (Political party)--History.
Socialism--Spain--La Rioja--History.
Socialists--Spain--La Rioja--Biography--Dictionaries.
Unión General de Trabajadores de España--History.
Harvard subject headings:
Princeton subject headings:
Dictionaries.
P.S.O.E. (Political party)--Biography--Dictionaries.
Socialists--Spain--La Rioja--Biography--Dictionaries.
Unión General de Trabajadores de España--Biography--Dictionaries.