《元史·本纪·卷十七》
二十二日，中书省大臣上奏说： 上都的工匠有二千九百九十九户，每年消费的公粮为一万五千二百余石，应当选出那些不切于实用的工匠，令他们到大都去就食。 
丁丑，中书省臣言： 上都工匠二千九百九十九户，岁縻官粮万五千二百余石，宜择其不切于用者，俾就食大都。 
On the 22nd day, the ministers of the Central Secretariat reported: There were 2,999 households of craftsmen in the Upper Capital, and more than 15,200 stones of official grain were consumed each year. Those craftsmen who were not practical should be selected and sent to Dadu to seek food.