Almost nothing; I'm a big fan of my local public library.
Only occasionally will we purchase a special, notable "keeper", that we want to have on hand as a reference, and that we'll pass around for everyone in the family to read. The last such purchase was the Jobs biography by Isaacson, since we are interested in technology and business.
We don't want to accumulate stuff in general, and will only reluctantly add significant classics such as this that will stand the test of time.
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