I didn't think you could set up Collections on Kindles with Calibre (unless you managed to have installed the hacks at least on an older firmware, but didn't think there's any way to do it on any newer Kindle)? Anyway, I have about 40 genres, and any series, all as Collections. I keep under 600 books on my reader though, so even for the larger Collections, it's manageable for me.
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