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Re:Books from 1923 to 1941 Now Liberated by toomuchtodo on Tuesday October 10, 2017 @05:25PM (#15445436)
You can upload them here: https://archive.org/upload/ (account required; free to create) and then send an email to the Internet Archive staff with the item identifier to have it added to Open Library.

If you don't mind shipping them the book(s):

Internet Archive, Attn: Book Donations, 300 Funston Avenue, San Francisco, CA 94118

If you have a large donation of books, please call first to make arrangements: (415) 561-6767

Re:Books from 1923 to 1941 Now Liberated by jonah-archive on Tuesday October 10, 2017 @05:54PM (#15445646)
For the interested, we also have a Python library for uploading/searching/etc: http://internetarchive.readthedocs.io