Columbia subject headings:
Castellón, Tomás de, active 1509-1526.
Puerto Rico--Commerce--History--16th century.
Puerto Rico--Social conditions--To 1898.
Harvard subject headings:
Castellón, Tomás de, active 1509-1530.
Puerto Rico--Commerce--History--16th century.
Puerto Rico--Social conditions--To 1898.
Princeton subject headings:
Castellón, Tomás de, active 1509-1526.
Puerto Rico--Commerce--History--16th century.
Puerto Rico--Social conditions.