I just go by my personal tastes. So I have separate categories for each of my favourite authors, where I am likely to have a whole lot of books by them. Then I have Pre-18th-Century for all sorts of classics, going back to the ancient Greeks. I have 18th-Century Literature, 19th-Century Literature, 20th-Century Literature, 21st-Century Literature, all for literary writing. Then Crime and Thrillers (speaks for itself) as do Science and Mathematics, and Philosophy, Sociology and Religion, and History. I also have a Miscellaneous category for stuff that doesn't fall into the other categories and everything in it is a one-off as far as my collection is concerned.
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