Information Source

Lawrence2397

Hi,

How would I find the source of the "Fang local surnames" information in this link ?
https://www.familysearch.org/en/chinese/village-finder/villages/718

Interested in verifying the primary source claim where Fangshan is located, according to the above:

"Fangshan Mountain (now central and northern Henan, from Luoyang Longmen in the west to the eastern border of Mixian County, covering Yichuan, Yunshi, Gongyi, Dengfeng, Yunyang, and Songshan in the territory of Mixian County)."