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It would be interesting to know how many "single format" DRMed ebooks there are out there. Practically all TOPAZ ebooks in the Kindle Store would be one large set. There are quite a few MOBI-only ebooks in the US (actually MOBI + Kindle, and now probably more prevalent because of the Kindle store). There used to be a lot of PDF-only (Adobe ebook), but there seem to be fewer new ebooks in this category. In the UK, there are many ePub-only ebooks.
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