Columbia subject headings:
Asia--Description and travel.
Iran--Description and travel.
Mongols--History.
Polo, Marco, 1254-1323? Travels of Marco Polo. French & Italian.
Voyages and travels.
Harvard subject headings:
Asia--Description and travel--Early works to 1800
Mongols--History--Early works to 1800.
Voyages and travels
Princeton subject headings: