Columbia subject headings:
P.S.O.E. (Political party)
Socialism--Spain--21st century.
Spain--Politics and government--21st century.
Harvard subject headings:
P.S.O.E. (Political party)--History.
Socialism--Spain--21st century.
Spain--Politics and government--1982-
Princeton subject headings:
P.S.O.E. (Political party)--History.
Socialism--Spain--21st century.
Spain--Politics and government--1982-