Does anyone know when and why these two books, Lianshan and Guizang, were lost?

In summer, there are mountains, in the shade, in Tibet, and in the week, there are Zhouyi.

It is said that Shennong Yijing is called Lianshan, Xuanyuan Emperor Yijing is called Ghost Hiding, and Zhou Dynasty Yijing was played by Zhou Wenwang.

It is said that:

It was Qin Shihuang who burned books to bury Confucianism and lost it.

Time: thirty-four years of Qin Shihuang-2 13 BC.