《汉书·传·王莽传中》
焚道县以南地区，山势险峻深邃，冯茂尽量把人民赶到远地居住，用费要用亿来计算，军官士兵遭受毒气死亡的达到十分之七。
僰道以南，山险高深，茂多驱众远居，费以亿计，吏士离毒气死者什七。
The area south of Fendao county is rugged and deep. Feng Mao tried to drive the people to live far away. The cost was calculated in hundreds of millions. 70% of the officers and soldiers died of poisoning.