General purpose and use of rare books of ancient books in China

The general catalogue is actually the property of an existing ancient book, and its uses are varied. Mainly: first, academic research, and second, market circulation reference. Learning pays attention to the possession of information, especially the traditional knowledge of China. Need to know the relevant ancient books in this area, such as whether an ancient book exists in the world and where it exists, you can look it up according to the catalogue. In the aspect of textual research, we can check the version and loss of some ancient books. If an ancient book is not included in the general catalogue, it means that it is extremely precious or worthless (it may be forged by future generations if it is not included).