Most of them were the reprinted editions of the Song or Yuan printings that had been introduced into Japan; many of them depict the past, and they are of great value as materials in studying woodblock printing.
その大多数は、日本に伝わった宋版や元版を覆刻したものであり、古様を伝えるものも多く、版本学的な資料価値が非常に高い。