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Topic
Landscapes
8
Great Wall of China (China)
7
Stone walls
6
Walls
6
Access denial (Military science)
4
Defensive (Military science)
4
Footbridges
4
Uplands
4
Fortification
3
Mountains
3
Barricades (Military science)
2
Illustrations
1
Language and culture--China
1
Rubble
1
