Digital images of xiu qiao ge jue, a book on building bridges. Date: 1930s. Author / scribe: Unknown.
"The original materials have been returned to their owners, who remain anonymous. The EAP143 project believes that a number of the original manuscripts were subsequently sold to different private collectors following digitisation.".
"The original materials are owned by Pan Yushan of Duyun, Guizhou.".
The original manuscript is owned by Wei Tianlu.
The original manuscript is owned by Wei Yongji.
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