Columbia subject headings:
P.S.O.E. (Political party)--History.
Socialism--Spain--History.
Socialist parties--Spain--History.
Spain--Politics and government--1975-1982.
Harvard subject headings:
P.S.O.E. (Political party)--History.
Socialism--Spain
Socialism--Spain--History
Socialist parties--Spain--History.
Spain--Politics and government--1975-1982.
Princeton subject headings:
P.S.O.E. (Political party)
Spain--Politics and government--1975-.