Initially I threw out everything.
Then I started collecting books I found at used book stores and hated to think some person would find them and get trapped so I started buying them. So I had a small collection of used books. Then one time I went to my mother's and went home with dozens of books - if only she knew then what I was doing with them
But I just got rid of those too - shredded them all. I just don't have the room here to keep them all