The famous scholar in Northern Song Dynasty, Yang Kan's Huangjifu is the first literary fu article in describing the Prefecture of Kaifeng, Dongjing at that time.
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不外,河南各个府州增加幅度其实不是同步的,重要是开封府、南阳府、汝宁府地盘的增加速度惊人。
However, the Henan government, the increase is not synchronous, important is Kaifeng house, Nanyang house, Ru Ning Fu site increased at an alarming rate.