Columbia subject headings:
Asia, Central--Description and travel.
Geography, Arab.
Geography, Medieval.
Middle East--Description and travel.
Harvard subject headings:
Asia, Central--Description and travel--History.
Geography, Arab.
Geography, Medieval.
Middle East--Description and travel--History.
Princeton subject headings:
Caliphate--History--Sources.
Europe, Eastern--Historical geography--Sources.
Islamic Empire--Historical geography--Sources.
Russia--Historical geography--Sources.