Columbia subject headings:
Mamelukes.
Slave trade--History--19th century.
Slaves--Emancipation--Yemen (Republic)--History.
Slaves--Yemen (Republic)--Social conditions.
Harvard subject headings:
Mamelukes.
Slave trade--History--19th century.
Slaves--Emancipation--Yemen--History.
Slaves--Yemen--Social conditions.
Princeton subject headings:
Slavery--Yemen--History.