What are the contents of Dunhuang documents?

The contents of Dunhuang documents involve astronomy, calendar, medicine, history, geography, politics, economy, military affairs, diplomacy, religion, society, folklore, nationality, philosophy, logic, Confucian classics, philosophers, literature, folk art, drama, phonology, language, writing, music, dance, painting, calligraphy, translation and dynasty.

What is particularly rare is that there are a large number of lost ancient documents here, which are of great value and unparalleled, and are known as "the ocean of ancient studies".