For ebooks from mainstream publishers: there are a few in Kindle and MOBI-only (i.e. not available in LRX, or LIT or ...) and I have come across a few in AZW-only. However, the vast majority of Kindle-only ebooks from mainstream publishers are TOPAZ ebooks. These are created by Amazon, using a propriety scanning and OCRing process. TOPAZ ebooks are often of lower quality, but on the other hand they are at least available. If you see a Kindle ebook without a filesize listed on its web page, the odds are very high that it is TOPAZ. Based on this criteria,The Resurrection of Jesus: John Dominic Crossan is TOPAZ.
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