Does the company you work for have a library? One of my friends works for an engineering firm and they maintain a library and they love old books about engineering etc. they have a librarian and everything! They are not in Ontario though.
You could also contact McMaster. My kids were always coming home with stuff from university that people donated. There must be an engineering or Math society there that would love them in their library or even their lounge (my kids didn’t go to Mac - so I can’t give you any contacts there).
Or sell on Marketplace. I do that a lot, then if it’s a kid or someone who is obviously not a reseller I would just tell them no charge.