There are several sites, including Amazon, that will directly buy back your used books. You can enter the ISBN and they will tell you how much they will give yo

There are several sites, including Amazon, that will directly buy back your used books. You can enter the ISBN and they will tell you how much they will give you for it. I would make packages with the ones that are said to have some value, and donate the rest. We have local services here that will take used books and send them to where they are more needed or put them in open booths at parks, maybe you have the same. It's a very good way to quickly go full digital and declutter the house. Some of the technical or scientific thick volumes were a pretty good deal.