Because many books were reprinted versions of books imported from Sung and Yuan (Sung and Yuan editions), we can see the ancient style of wood-block printing in these books, and many of them are highly valued as materials by which to study the history of printing.
その多くは、日本に伝来した宋版や元版（宋元版）を底本として覆刻されたものであったため、木版印刷の古様を伝えるものが多く、書誌学的な資料価値が非常に高いものが多く存在する。