Columbia subject headings:
Harvard subject headings:
Muñoz Marín, Luis, 1898-1980.
Puerto Rico--Politics and government--1952-
Sánchez Vilella, Roberto, 1913-1997.
Princeton subject headings:
Muñoz Marín, Luis, 1898-1980.
Puerto Rico--Politics and government--1952-1998.
Sánchez Vilella, Roberto, 1913-1997.