Columbia subject headings:
Europe--Civilization.
Islamic civilization--History.
Travel, Medieval.
Travelers--History.
Harvard subject headings:
Geography, Arab.
Geography, Medieval.
Islamic Empire--Description and travel.
Middle East--Description and travel.
Renaissance.
Travelers--Africa, North.
Travelers--Europe
Travelers--Middle East.
Princeton subject headings:
Civilization, Medieval.
Islamic civilization--History.
Middle East--Description and travel.