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The first kind looks like ToC markers. No idea why the title looks like a hash of some kind though, that's not exactly what the attribute is for. It doesn't impact the book's contents at all, though, so at worst there's no hurt in keeping them where they are.
The second is an image encoded in base64 instead of being linked to a separate file. Again, no idea what it's supposed to be for, but it looks like some kind of barcode. Depending on the book, it may have some real significance. Or not.
You can remove all of those by finding the right regexp in a search/replace.
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