Nope. I can download (or create) anything I want, in any format (epub, pdf, txt, etc.) that my e-reader can understand, and load it on there.
I joke that I bought it so I could read Project Gutenberg in bed, and while that's not entirely true, there are a thousand or so books from PG on there. Trust me, they don't have ISBNs. Nor, for that matter, did they ever go near Smashwords (though I have bought books from there).
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