The epubs have come from various places (I've tried a good number). Most were converted at one time or another by Calibre. The Guernsey one is a particular example of a commercial epub that was never fiddled with by Calibre (it's direct from Overdrive from the library). None of my epubs on my Calibre library have ever thrown an error, three years on Kobos, ipads with Stanza/MegaReader/Bluefire/iBooks, PCs and Macs using Calibre reader or Firefox reader.
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