PSA: The Internet Archive will work with you to pack, ship, and archive collections of books, audio records, periodicals, and other media. You can reach out to them at donations@archive.org to discuss the transfer of physical items or entire collections.
If you are interested in volunteering for collection sorting and packing ops, signup for Jason Scott’s ArchiveCorps mailing list. Low volume, a couple times per year.
Finally, if you work at, are associated with, or know of a library of any sort that intends to close for whatever reason, please point them to the Internet Archive. They’ll work with them to ingest their entire corpus.
https://archive.org/details/marygrove
https://help.archive.org/help/how-do-i-make-a-physical-donat...
https://help.archive.org/help/media-types-for-donations/
https://help.archive.org/help/does-the-internet-archive-have...
(not associated with the Internet Archive in any way)