Columbia subject headings:
Puerto Rico--Economic conditions.
Puerto Rico--History--Insurrection, 1868.
Puerto Rico--Social conditions.
Harvard subject headings:
Puerto Rico--Economic conditions
Puerto Rico--History--Insurrection, 1868.
Puerto Rico--Social conditions.
Princeton subject headings:
Puerto Rico--Economic conditions.
Puerto Rico--History--Insurrection, 1868.
Puerto Rico--Social conditions.