What do you mean by nine branches?

The meaning of Jiuzhi Library is as follows. According to the relevant public information, books with paper for practicing calligraphy and paper for practicing calligraphy are bound into books, which are called paper library and dividend white, red paper library is used for tracing red, and white paper library is used for drawing models. The so-called paper warehouse for the restoration of ancient books refers to the warehouse that specially buys and stores the paper for the restoration of ancient books.