First of all, a column has been set up on the classic website of China, and the electronic versions of related collections are being released one after another. /forum.php? The forum shows. fid=44
Secondly, the website of the National Library, Special Collection of China Rare Books and Ancient Books in Harvard Yanjing Library, /home/index.trs? Channelid=724 The National Library of China and the Harvard University Library have agreed to jointly develop these resources, and will complete the digital photography of 42 10 kinds of 5 1889 volumes of Chinese rare books within six years.
As for the Japanese books in Hanhe Library, I don't know much about them.
For reference only.
In addition, the libraries of various colleges of Harvard University also collect some electronic books. You can visit this link and browse online: http://hcl.harvard.edu/collections/digital _ Collection/Exploration.cfm.
If you really can't find the electronic version of the book you want, I suggest you contact Harvard Yanjing Library, which can provide interlibrary loan service to libraries outside Harvard.
http://hcl.harvard.edu/info/interlibrary_loan/ill_hyl.cfm