Sabin elementary school in NE has literally thousands of books sitting in little mountains right in the gymnasium. The signs say "recycle books here". From what it looks like, many other schools have dropped their books off at Sabin as well. There are lots of great older educational materials. These books are not being recycled, they are going to be burned.
The school is open Monday through Friday from 8:30 am to 5pm because of summer camp. Come get some books. The side door by the dumpsters will be open and it might be good to talk to someone in the summer camp staff to give them a heads up that you're there to grab books.
NE 18th and Failing. Sabin Elementary.