I use them a lot. I have some for:
- Awards (if it won any awards, they are noted here)
- Formatting (checkbox if book had errors or format flaws)
- Free (so I can delete it, guilt-free, if I don't like it)
- Collection (regular, children, French, iPad so I can filter and only view a subset)
- Genre (so I can make a tree with it)
- Source (where I got the book)
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