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Subject (Era)
- To 221 B.C.902
- Han dynasty, 202 B.C.-220 A.D.268
- Qin dynasty, 221-207 B.C.254
- 221 B.C.-960 A.D.138
- 960-164430
- To 22030
- Shang dynasty, 1766-1122 B.C.15
- Qin-Han dynasties, 221 B.C.-220 A.D.14
- Tang dynasty, 618-90714
- Zhou dynasty, 1122-221 B.C.13
- Song dynasty, 960-127912
- Chʻin dynasty, 221-207 B.C.11
- To 221 B. C.10
- To 9357
- Spring and Autumn period, 722-481 B.C.5
- To 15005
- To 9605
- Warring States, 403-221 B.C.5
- 221 B.C.-220 A.D.4
- Duo 221 B.C.4