Columbia subject headings:
Sudan--Description and travel.
Tūnisī, Zayn al-Abidīn, active 19th century.
Harvard subject headings:
Sudan--Description and travel.
Tūnisī, Zayn al-Abidīn, active 19th century.
Princeton subject headings:
Sudan--Description and travel.
Tūnisī, Zayn al-Abidīn, active 19th century.