《元史·本纪·卷二十八》
五月初一，设置大理路白盐城征税官，品秩为正七品；中庆路征税官，秩为从七品。
五月辛卯，设大理路白盐城榷税官，秩正七品；中庆路榷税官，秩从七品。
On the first day of the fifth month, the Dali Road Ba盐城 Tax Officer was established, with a rank of seventh grade; the Zhongqing Road Tax Officer was established, with a rank of seventh grade.