Earlier quoted context omitted.
You could digitize them if you think you (or your family/friends/etc.) would read them: https://www.diybookscanner.org/ (If any are public domain, consider scanning them and uploading to archive.org!)
That’s no good to me. It’s the physical volumes I need to get rid of. I couldn’t give a fiddlers about what’s in them
Donate them to Better World Books or some similar group?