Columbia subject headings:
Harvard subject headings:
Delgado, Humberto da Silva, 1906-1965
Elections--Portugal--History--20th century.
Portugal--Politics and government--1933-1974
Princeton subject headings:
Delgado, Humberto da Silva, 1906-1965.
Elections--Portugal--History--20th century.
Portugal--Politics and government--1933-1974.
Presidents--Portugal--Elections--1958.