Columbia subject headings:
Harvard subject headings:
Beijing (China)--Description and travel--Pictorial works.
Gates--China--Beijing--Pictorial works.
Gateways--China--Beijing--Pictorial works.
Princeton subject headings:
Beijing (China)--Description and travel--Pictorial works.
Gates--China--Beijing--Pictorial works.
Gateways--China--Beijing--Pictorial works.