Columbia subject headings:
Excavations (Archaeology)--Mongolia--Tuul River Watershed.
Extinct cities--Mongolia--Tuul River Watershed.
Khitan (Chinese people)--Mongolia--Tuul River Watershed.
Tuul River Watershed (Mongolia)--Antiquities.
Harvard subject headings:
Princeton subject headings:
Excavations (Archaeology)--Mongolia--Tuul River Watershed.
Extinct cities--Mongolia--Tuul River Watershed.
Khitan (Chinese people)--Mongolia--Tuul River Watershed.
Tuul River Watershed (Mongolia)--Antiquities.