Columbia subject headings:
Puerto Ricans--United States--Economic conditions.
Puerto Ricans--United States--Social conditions.
United States--Race relations.
Harvard subject headings:
Puerto Ricans--United States--Economic conditions.
Puerto Ricans--United States--Social conditions.
United States--Race relations
Princeton subject headings:
Puerto Ricans--United States--Economic conditions.
Puerto Ricans--United States--Social conditions.
United States--Race relations.