What are the three episodes in Zeng Guofan's diary?

The three episodes here are Poetry Collection (the earliest existing poetry collection in China), Changli Collection and Du Collection.

Zeng Guofan's original letter:

It's also good to learn poetry from Zhongzhou Collection, but I prefer to read general collections rather than special collections. Everyone has different views and hobbies on this matter. My hobby is reading five ancient prose selections, seven ancient Changli collections, five-law Du collections and seven-law Du poems.