Legend (Beijing_historical_boundaries)
1800 (0)
|
1875 (1)
|
1900 (2)
|
1929 (3)
|
1959 (4)
|
1978 (5)
|
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1800 (0)
|
1875 (1)
|
1900 (2)
|
1929 (3)
|
1959 (4)
|
1978 (5)
|
