论秦汉时期北地郡的设置及变迁与西北少数民族的活动
The Settings and Changes of Bei-di Jun and Activities of Minority Northwest in Qin and Han Dynasties
战国末期为秦国领地，秦统一中国后属北地郡。
Qin territory for the late Warring States , Qin unified China after a county in the north .
北地郡