Title: Liang qian nian shi ji xue yan jiu
Subjects: History, Han Dynasty (China), Qin Dynasty (China), Shi ji (Sima, Qian)
Places: China
People: Qian Sima (approximately 145 B.C.-approximately 86 B.C)
Time periods: To 221 B.C., Qin dynasty, 221-207 B.C., Han dynasty, 202 B.C.-220 A.D.