《明史·列传·卷一百零二》
杨博依照水势修建石墩，安排戍卒守卫，自己返京督守京城九门。
博缘水势建石墩，置戍守，还督京城九门。
Yang Bo built stone piers based on the movement of the water, arranged for garrison soldiers to patrol, and personally returned to the capital to direct the defense of nine city gates.