PG ePubs gave me some problems in the past (page size, mainly, which is WEIRD). I still use them, not having calibre because of compatibility problems with current OS; if I had calibre I'd get html files and convert them to ePub. Sometimes I also try my hand with Sigil (freeware for ePub creation), but I find that html from PG is crappier than, say, the one from WikiSource (which is a lot!), and I have to clean it up a bit before use.
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