Columbia subject headings:
Concepción de Gracia, Gilberto, 1909-1968.
Partido Independentista Puertorriqueño.
Politicians--Puerto Rico--Biography.
Puerto Rico--Politics and government--1952-1998.
Harvard subject headings:
Concepción de Gracia, Gilberto, 1909-1968.
Partido Independentista Puertorriqueño.
Politicians--Puerto Rico--Biography.
Puerto Rico--Politics and government--1952-
Puerto Rico--Politics and government--1952-1998.
Princeton subject headings:
Concepción de Gracia, Gilberto, 1909-1968.
Partido Independentista Puertorriqueño.
Puerto Rico--Politics and government--1952-1998.