《宋史·列传·卷九十四》
西部边地用兵，守备不足，世衡建议，延州东北二百里有故宽州，请求因其被废弃的城垒而兴建，用来抵挡敌人的锋锐，右可稳固延安的形势，左可致河东的粟米，向北可图取银、夏州的旧地。
西边用兵，守备不足。世衡建言，延安东北二百里有故宽州，请因其废垒而兴之，以当寇冲，右可固延安之势，左可致河东之粟，北可图银、夏之旧。
There was a shortage of guards in the western border area. Shi Heng suggested that there was a former Kuangzhou two hundred miles northeast of Yanzhou, and asked to build on its abandoned fortresses, in order to resist the enemy's edge, and to the right to stabilize the situation in Yanan, to the left to lead to the millet of Hedong, and to the north to take the old lands of Yin and Xiazhou.