What are the records about the development of pond salt in ancient books?

The official record of the development of pond salt began in Zuo Zhuan, saying, "In the sixth year of Jin reign, the doctors said,' If you are in trouble, you will go to prison, benefit the country and enjoy the country. You can't lose it. ""It can be seen that it was profitable to mine Hedong salt at that time. The Water Mirror Notes made a textual research on this sentence, saying: "History of Han Geography says:' Yanchi is in the southwest of Anyi.' Today, the water in the pool is 70 miles long from east to west and 17 miles long from north to south. Purple and clear, muddy and not flowing. Water is naturally printed with salt, and it will be repeated in the morning and evening without loss. Salt ponds will be consumed only when there is a water storm and rain water flows. Therefore, public and private exhaust waterways are used to prevent their abuse, so they are called salt water, which is also used for exhaust. Therefore, the classic of mountains and seas refers to the luster of salt vendors ... "Spring and Autumn Annals" said: "In six years, Kim died of crimson, and the doctor said:' Although there are mistakes, he lies near salt.' Fu Qian said,' Irrigation with soil and water, fertilizer, salt and supervision. The local custom of the natives is to divert water from Sichuan to Sichuan. When the water in the soil is exhausted, it is called salty. And the bitter taste, named Yantian, the name of salt supervisor, is the beginning. "According to this theory, in the Spring and Autumn Period, the salt people in Xiezhou have adopted the original method of drying salt.