How to select ancient books in Qing dynasty

1. Detailed explanation of dynasty series-Li Dongfang 2. On the Twelve Emperors of Qing Dynasty-Yan Chongnian 3. On the 300 Years of Qing Dynasty-Lin Tao 4. Notes on the Secret Files of the Qing Palace: 1 Explain that the words "Zheng Shuo" and "Zheng" are