What are the earliest ancient books in China?

About the earliest ancient books in China, there were also three tombs, five classics, eight places and nine hills in the era of Three Emperors and Five Emperors. "Twelve Years of Zuo Gong" said: "Zi Chu was born in Zhangzhou, but left leaning has surpassed him. Wang said, "I am a good historian, and I can read Sanzu Tomb, Five Classics, Eight Classics and jiusan. This passage records the praise of the king of Chu to Yi Xiang, saying that he is a learned historian and can read ancient books such as Sanzu Tomb. Kong Anguo's Preface to the Book of History in the Western Han Dynasty once explained that the three graves are the classics of Fuxi, Shennong and Huangdi Huang San, and they are the "road to talk"; The Five Classics are the classics of Shao Hao, Zhuan Xu, Gao Xin, Tang Yao and Yu Shun. Eight categories are gossip books; Nine Mountains is a chronicle of nine states. However, Kong Anguo did not say that he had seen these books, and there were no records of these books in Hanshu Yiwenzhi, which recorded the ancient books of the Western Han Dynasty. Among the ancient books that have been handed down to this day, although there are also masterpieces such as Three Graves, Five Classics, Eight Categories and Nine Hills, they have long been classified as fake books. As for the "Three Emperors and Five Emperors" era in ancient China, the current literature research and archaeological excavations can't prove its real existence, and the "Three Emperors and Five Emperors" era is only a legend about the military tribal system in China's primitive society. Therefore, it is not credible to regard the Three Graves, Five Classics, Eight Sorts and Nine Hills as the beginning of China's classics. This legend only reflects the long history of China classics.