Columbia subject headings:
Constitutional history--Puerto Rico.
Fernós Isern, Antonio, 1895-1974.
Freemasonry--Puerto Rico.
Public health--Puerto Rico--History.
Puerto Rico--Foreign relations--United States.
Puerto Rico--Politics and government--1898-1952.
Puerto Rico--Politics and government--1952-1998.
United States--Foreign relations--Puerto Rico.
Harvard subject headings:
Princeton subject headings:
Cardiologists--Puerto Rico--Biography.
Fernós Isern, Antonio, 1895-1974.
Puerto Rico--Politics and government--1898-1952.
Statesmen--Puerto Rico--Biography.