Columbia subject headings:
Harvard subject headings:
Caribbean Area--Economic conditions--1945-
Caribbean Area--Relations--Puerto Rico.
Caribbean Area--Relations--United States.
Puerto Rico--Politics and government--1952-
Puerto Rico--Relations--Caribbean Area.
United States--Relations--Caribbean Area.
Princeton subject headings:
Caribbean Area--Relations--United States.
Puerto Rico--Politics and government--1952-1998.
Puerto Rico--Relations--United States.
United States--Relations--Caribbean Area.
United States--Relations--Puerto Rico.