《明史·列传·卷六十一》
六年，石亨上书说道： 边晌缺乏，请求分调大同左、右、王林、云川四卫军，前去开垦净水坪迄西的荒土，由官府供给耕牛和种子，这样每年便可增加粮食一万八千石。 
六年上言： 边饷难继，请分大同左右、玉林、云川四卫军，垦净水坪迤西旷土，官给牛种，可岁增粮万八千石。 
In the sixth year, Shi Heng submitted a report, saying: The border is short of food, please reconsider the division and deployment of the Left, Right, Wanglin, and Yun 川 Guards to open up the wasteland from Jingshui Ping to the west, and the government shall provide farm oxen and seeds to the region, which will increase grain provisions by 18,000 shi annually.