《徐霞客游记·滇游日记三十三》
三里后稍下走，见一个山坞横在前面，它西面的下边就是乌索近旁的村子，它南边越过去就是雅乌山西面的山坳了，才醒悟过来这是去固栋的路。
三里稍下，见一坞横前，其西下即乌索之旁村，其南逾即雅乌之西坳矣，乃悟此为固栋道。
After three li, I went down a little bit and saw a mountain dock lying in front of me, to the west of which was a village near Wuso, to the south of which was the mountain pass on the west side of Yawang Mountain, and then I realized that this was the road to Gudong.