Columbia subject headings:
Aden (Yemen)--Biography.
Aden (Yemen)--Economic conditions.
Aden (Yemen)--History.
Aden (Yemen)--Religious life.
Aden (Yemen)--Social conditions.
Islamic Empire--History--1258-1517.
Merchant marine--Yemen (Republic)--History.
Harvard subject headings:
Princeton subject headings:
Aden (Yemen)--Biography.
Aden (Yemen)--Economic conditions.
Aden (Yemen)--History.
Aden (Yemen)--Religious life.
Aden (Yemen)--Social conditions.
Islamic Empire--History--1258-1517.
Merchant marine--Yemen (Republic)--History.