Columbia subject headings:
Brazil--Politics and government--20th century.
Partido Socialista Brasileiro--History.
Socialism--Brazil--Pernambuco.
Socialism--Brazil.
Harvard subject headings:
Brazil--Politics and government--20th century.
Partido Socialista Brasileiro--History.
Socialism--Brazil
Socialism--Brazil--Pernambuco.
Princeton subject headings:
Brazil--Politics and government--1930-1945.
Brazil--Politics and government--1945-1954.
Partido Socialista Brasileiro.
Socialism--Brazil--History.