Columbia subject headings:
Harvard subject headings:
Asia--Description and travel
Asia--Description and travel--Early works to 1800
Mongolia--Description and travel
Mongols--History
Mongols--History--To 1500
Möngke Khan, approximately 1208-1259.
Ruysbroeck, Willem van, approximately 1210-approximately 1270--Journeys--Asia.
Princeton subject headings:
Asia--Description and travel.
Mongols--History.