I just try to subdivide my non-fiction into groups that are between 20 and 200 books. I don't bother to classify to the same level.
I would just use "Self-improvement", since I don't have so many books of that type.
I even have a classification Nonfiction.Other where I have a bunch of different books on various topics.
Last edited by Adoby; 08-03-2014 at 11:40 PM.
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