《明史·列传·卷六十》
当时皇上派遣官员测量两镇军田，一军八十亩以外，都征税五升。
时遣官度二镇军田，一军八十亩外，悉征税五升。
At that time, the emperor sent officials to measure the military land of the two towns, and all land in excess of eighty mu per military unit was taxed at a rate of five dou.