Public domain
Regulations for River Works: Huai-Xu Circuit, 5 Volumes; Huai-Yang Circuit, 7 Volumes [2]
From the collection of National Diet Library, Japan. Free to download, adapt and use — no permission needed.
Subjects
Credit line題定河工則例淮徐道屬5卷淮揚道屬7卷 [2]. 乾隆刊. National Diet Library, Japan. Public domain.