Columbia subject headings:
Harvard subject headings:
Sao Tome and Principe--History.
Slave trade--Sao Tome and Principe--History.
Slavery--Sao Tome and Principe--History.
Princeton subject headings:
Sao Tome and Principe--History.
Slave trade--Sao Tome and Principe--History.
Slavery--Sao Tome and Principe--History.