Interest check

So my dad passed away three weeks ago and we’ve been going through his stuff. In life he was an electrical engineer and mathematician. Over the years he collected shelves of old, out of print textbooks -physics, mathematics, and other sciences- that are all in pristine or nearly new condition. Is there even a draw for that, collection-wise? I know someone somewhere has to collect old textbooks, like he did, and I would love for the ones I don’t keep myself to find a loving home.

As a book lover myself, I can’t stand to see them be thrown away or donated to someplace that won’t see their value.

I don’t even know if this is the right place to ask, but I would love any thoughts or advice. We’ve already been checking all the standard resale places; they’re out there for sale, in worse condition than my dad’s (he was autistic and prized his collection).

Love and thanks,
B