《明史·志·卷五十六》
盐课提举司七个：一是广东，一是海北，一是四川，一是云南；云南提举司共有四个，称焉黑盐井，白盐井，安宁盐井，五井。
盐课提举司七：曰广东，曰海北，曰四川，曰云南；云南提举司凡四，曰黑盐井，白盐井，安宁盐井，五井。
There were seven Inspectorates of Salt Collection: Guangdong, Haibei, Sichuan, Yunnan, and Shanxi; Yunnan Inspectorate of Salt Collection included four salt wells, called Yanhei salt well, Baizhan salt well, Anning salt well, and Wu jing.