《徐霞客游记·滇游日记三十二》
一里，又有路自东南延来，向西北越岭而去，这就是州里通往冠子坪的路。
一里，又有路自东南来，西北逾岭去，此即州中趋冠子坪道。
After a mile, there was another road that stretched from the southeast and crossed the ridge to the northwest. This was the road from the state to Guanziping.