《明史·列传·卷一百一十五》
起初，实行丈量土地法，延、宁二镇增加田地一万八千余顷。
初，行丈量法，延、宁二镇益田万八千余顷。
At the beginning, when the land measurement method was implemented, Yan and Ning two towns increased the cultivated land by more than 18,000 hectares.