There are books I accumulated during graduate school that I never read, and others that reading once was enough, so I've started a box. I'll offer first choice to academic friends who still work with these, and then the books go either on Amazon or to my local half price bookstore. I'll keep a list of the discards just in case I decide to go looking for one on my shelves in the future (that will save me the work when it isn't there). The dust on the shelves is making itself felt this morning.