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No matter how much you love books, eventually you’ll have too many (unless you plan to move them into their own house and found a library!).
Good places to donate books are: your local library (make sure they can use them), shelters, schools, daycare programs, literacy programs, hospitals, hostels, and of course used book stores.
Ways to accumulate fewer books: use the library (including inter-library loan if your local library doesn’t have what you want), trade books with friends, create a special interest library for club members, institute a “one in, one out” rule.