《徐霞客游记·滇游日记三十二》
又往西下行一里，顺江北岸往西行二里，开始有村庄房屋依傍在冈头，这是乌索。
又西下一里，随江北岸西行二里，始有村庐倚冈头，是为乌索。
Going west for another li, and going west along the north bank of the river for two li, there are now villages and houses close to the top of the hill, this is Wusuo.