Parts of the book went missing from the early Tang dynasty and did not survive intact.
It originally contained 100 volumes, a preface and a chronological table.
By the time of the early Song dynasty, many of them were lost and only about 20 volumes remained, which were quoted extensively by Sima Guang.
There are two extant versions dating from the late Ming dynasty, the edition by Tu Qiaosun containing 100 volumes, and the one by He Tang containing 16 volumes, reprinted in the Hanwei Congshu, a compilation of histories.
This article about a non-fiction book on Chinese history is a stub.