《元史·本纪·卷十八》
十一日，派遣大都留守段真、平章政事范文虎监督疏浚通惠河，赐给二品银印。
己丑，以大都留守段贞、平章政事范文虎监浚通惠河，给二品银印。
On Lunar 11, Duan Zhen, the Grand Metropolitan Governor, and Fan Wenhu, the Chancellor of Political Affairs, were dispatched to supervise the dredging of the Tonghui River, and were granted silver seals of the second rank.