Libraries don't take books- if they do, they have to destroy them. I'd post them on Craiglist or if you have a local FB group in your neighborhood, there may be someone wiling to take them off your hands.
What sorts of subjects do they cover? I may be interested.
I just gave about 5 years of National Geographic to a library in Longmont.
Don't pick a fight with an old man. If he is too old to Fight, he'll just kill you.