《史记·七十列传·货殖列传》
只有卓氏说： 葭萌地方狭小，土地瘠薄，我听说汶山下面是肥沃的田野，地里长着大芋头，形状象蹲伏的鸱鸟，人到死也不会挨饿。
唯卓氏曰： 此地狭薄。吾闻汶山之下，沃野，下有蹲鸱，至死不饥。
Only Zhuo said: The Jiamo area is small and the land is barren. I heard that under Wenshan Mountain is a fertile field. There are big yams in the field, shaped like a squatting owl, and people will not starve to death.